refactor(MainViewModel): Remove redundant toString call

- Removed an unnecessary `.toString()` call when retrieving a localized string resource.

app/src/main/java/com/grkj/iscs/features/main/viewmodel/MainViewModel.kt

@@ -141,7 +141,6 @@ class MainViewModel @Inject constructor(
                                                             .controlKeyBuckle(true, mac) {
                                                                 showTip(
                                                                     CommonUtils.getStr("ticket_get_failed")
-                                                                        .toString()
                                                                 )
                                                             }
                                                     }