fix: taskchampion sync made persistent (#457)

---
Fixed simple typo for taskchampion shared preference settings

Author: SGI-CAPP-AT2

lib/app/modules/home/controllers/home_controller.dart

@@ -128,7 +128,7 @@ class HomeController extends GetxController {
 
   Future<void> _loadTaskChampion() async {
     final SharedPreferences prefs = await SharedPreferences.getInstance();
-    taskchampion.value = prefs.getBool('taskchampion') ?? false;
+    taskchampion.value = prefs.getBool('settings_taskc') ?? false;
   }
 
   void addListenerToScrollController() {

lib/app/modules/settings/controllers/settings_controller.dart

@@ -179,7 +179,7 @@ class SettingsController extends GetxController {
         prefs.getBool('sync-OnTaskCreate') ?? false;
     delaytask.value = prefs.getBool('delaytask') ?? false;
     change24hr.value = prefs.getBool('24hourformate') ?? false;
-    taskchampion.value = prefs.getBool('taskc') ?? false;
+    taskchampion.value = prefs.getBool('settings_taskc') ?? false;
     initDarkMode();
     baseDirectory.value = await getBaseDirectory();
     super.onInit();

lib/app/modules/settings/views/settings_page_taskchampion.dart

@@ -20,7 +20,7 @@ class SettingsPageTaskchampionTileListTileTrailing extends StatelessWidget {
           controller.taskchampion.value = value;
 
           final SharedPreferences prefs = await SharedPreferences.getInstance();
-          await prefs.setBool('taskc', value);
+          await prefs.setBool('settings_taskc', value);
           Get.find<HomeController>().taskchampion.value = value;
         },
       ),