Set current playing cover art background to black

This makes non square cover art look better.

Persephone/Components/Queue/QueueViewController.swift

@@ -29,6 +29,9 @@ class QueueViewController: NSViewController {
     queueView.columnAutoresizingStyle = .sequentialColumnAutoresizingStyle
     queueView.registerForDraggedTypes([.songPasteboardType, .albumPasteboardType])
     queueView.draggingDestinationFeedbackStyle = .regular
+    
+    queueCoverArtImage.wantsLayer = true
+    queueCoverArtImage.layer?.backgroundColor = CGColor.black
   }
 
   deinit {

Persephone/Components/Window/Base.lproj/Main.storyboard

@@ -666,7 +666,7 @@
                                             <tableColumns>
                                                 <tableColumn identifier="songCoverColumn" width="43" minWidth="42" maxWidth="1000" id="0Co-uF-CCB" userLabel="Position">
                                                     <tableHeaderCell key="headerCell" lineBreakMode="truncatingTail" borderStyle="border">
-                                                        <font key="font" metaFont="menu" size="11"/>
+                                                        <font key="font" metaFont="controlContent" size="11"/>
                                                         <color key="textColor" name="headerTextColor" catalog="System" colorSpace="catalog"/>
                                                         <color key="backgroundColor" name="headerColor" catalog="System" colorSpace="catalog"/>
                                                     </tableHeaderCell>
@@ -712,7 +712,7 @@
                                                 </tableColumn>
                                                 <tableColumn identifier="songInfoColumn" width="213" minWidth="10" maxWidth="3.4028234663852886e+38" id="HP0-ty-PFY" userLabel="Song Info">
                                                     <tableHeaderCell key="headerCell" lineBreakMode="truncatingTail" borderStyle="border" alignment="left">
-                                                        <font key="font" metaFont="menu" size="11"/>
+                                                        <font key="font" metaFont="controlContent" size="11"/>
                                                         <color key="textColor" name="headerTextColor" catalog="System" colorSpace="catalog"/>
                                                         <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                                     </tableHeaderCell>
@@ -761,7 +761,7 @@
                                                 </tableColumn>
                                                 <tableColumn identifier="songDurationColumn" width="64" minWidth="64" maxWidth="64" id="8O6-ox-kx2" userLabel="Duration">
                                                     <tableHeaderCell key="headerCell" lineBreakMode="truncatingTail" borderStyle="border" alignment="left">
-                                                        <font key="font" metaFont="menu" size="11"/>
+                                                        <font key="font" metaFont="controlContent" size="11"/>
                                                         <color key="textColor" name="headerTextColor" catalog="System" colorSpace="catalog"/>
                                                         <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                                     </tableHeaderCell>