Allow to clear applet shortcuts again

captureFinished only fires if a capture was done, when pressing the clear it is
not emitted. So we have to go back to listening for keySequence changes and
comparing the keySequence to not emit configurationChanged on initial load.
BUG:429500

desktoppackage/contents/configuration/ConfigurationShortcuts.qml

@@ -43,7 +43,9 @@ Item {
             id: button
             keySequence: plasmoid.globalShortcut
             onKeySequenceChanged: {
-                root.configurationChanged();
+                if (keySequence != plasmoid.globalShortcut) {
+                    root.configurationChanged();
+                }
             }
         }
     }