move destroyOnClose into ImagePackSettingsDialog

resources/qml/dialogs/ImagePackDeleteDialog.qml

@@ -19,6 +19,5 @@ P.MessageDialog {
     onAccepted: {
         console.info("deleting image pack " + imagePack.packname);
         imagePack.remove()
-        timelineRoot.destroyOnClose(dialog);
     }
 }

resources/qml/dialogs/ImagePackSettingsDialog.qml

@@ -215,6 +215,7 @@ ApplicationWindow {
                                     "imagePack": currentPack
                                 });
                                 dialog.open();
+                                timelineRoot.destroyOnClose(dialog);
                             }
                         }
                     }