Fix unthemed label

Since in dark mode it stays black and it disappears in the background.

CURA-8421

resources/qml/ApplicationSwitcher/ApplicationButton.qml

@@ -95,6 +95,7 @@ Button
             verticalAlignment: Text.AlignVCenter
             wrapMode: Text.Wrap
             elide: Text.ElideRight
+            color: UM.Theme.getColor("primary_text")
         }
     }
 }