fix some issues at Moving files

app/src/main/kotlin/com/simplemobiletools/gallery/dialogs/CopyDialog.kt

@@ -90,10 +90,11 @@ class CopyDialog(val activity: SimpleActivity, val files: ArrayList<File>, val c
                             if (file.renameTo(destination))
                                 updatedFiles.add(destination)
                         }
-
                         context.scanFiles(updatedFiles) {
-                            dismiss()
+                            activity.runOnUiThread {
                                 copyMoveListener.copySucceeded(true, files.size * 2 == updatedFiles.size)
+                                dismiss()
+                            }
                         }
                     }
                 }