Fix apps view (#4056)

The apps view shows an extra rectangle in the icons when they
are hovered by the cursor.

This patch fixes it (extracted from patch for gnome 46 for
Dash to Dock).

gnome-shell/src/gnome-shell-sass/_dock.scss

@@ -240,11 +240,14 @@ $dock_style_modes: [null, shrink, extended, extended-shrink];
     border: 0px;
 }
 
-.overview-tile .overview-icon, .show-apps .overview-icon {
+.dash-item-container .overview-tile .overview-icon,
+.dash-item-container .show-apps .overview-icon {
     background-color: rgba(255,255,255,0);
 }
 
-.overview-tile:hover .overview-icon, .overview-tile.focused .overview-icon, .show-apps:hover .overview-icon {
+.dash-item-container .overview-tile:hover .overview-icon,
+.dash-item-container .overview-tile.focused .overview-icon,
+.dash-item-container .show-apps:hover .overview-icon {
     background-color: $remark_color;
 }