Fix preference errors

app/src/debug/java/org/tasks/preferences/DebugPreferences.java

@@ -24,8 +24,10 @@ public class DebugPreferences extends InjectingPreferenceActivity {
       findPreference(pref)
           .setOnPreferenceChangeListener(
               (preference, newValue) -> {
+                if (newValue != null && ((Boolean) newValue)) {
                   showRestartDialog();
-                return false;
+                }
+                return true;
               });
     }
   }

app/src/main/res/values/keys.xml

@@ -309,5 +309,5 @@
   <string name="p_place_provider">place_provider</string>
   <string name="preference_screen">preference_screen</string>
   <string name="p_add_google_task_account">add_google_task_account</string>
-  <string name="p_add_caldav_account">add_google_task_account</string>
+  <string name="p_add_caldav_account">add_caldav_account</string>
 </resources>