Revert "feat(launcher): trying a less boxy look"

This reverts commit 96930af759.

Modules/Panels/Launcher/LauncherGridDelegate.qml

@@ -30,7 +30,7 @@ Item {
     id: gridEntry
     anchors.fill: parent
     anchors.margins: Style.marginXXS
-    color: gridEntryContainer.isSelected ? Color.mHover : "transparent"
+    color: gridEntryContainer.isSelected ? Color.mHover : Color.mSurfaceVariant
     forceOpaque: gridEntryContainer.isSelected
 
     Behavior on color {

Modules/Panels/Launcher/LauncherListDelegate.qml

@@ -18,7 +18,7 @@ NBox {
   width: ListView.view.width
   implicitHeight: launcher.entryHeight
   clip: true
-  color: entry.isSelected ? Color.mHover : "transparent"
+  color: entry.isSelected ? Color.mHover : Color.mSurfaceVariant
   forceOpaque: entry.isSelected
 
   // Prepare item when it becomes visible (e.g., decode images)