Use normal and consistent KDE-style font weights

We don't use light text in many places, and the uses here weren't
internally consistent anyway.

src/qml/ListBrowserDelegate.qml

@@ -306,9 +306,6 @@ FocusScope {
 
                 text: duration
 
-                font.weight: Font.Light
-                color: myPalette.text
-
                 horizontalAlignment: Text.AlignRight
 
                 Layout.alignment: Qt.AlignVCenter | Qt.AlignRight

src/qml/PlayListEntry.qml

@@ -167,7 +167,7 @@ FocusScope {
                     }
                 }
 
-                font.weight: (isPlaying ? Font.Bold : Font.Light)
+                font.weight: (isPlaying ? Font.Bold : Font.Normal)
                 color: simpleMode ? myPalette.highlightedText : myPalette.text
 
                 visible: isValid && !playIcon.visible