Fix hiding sync from amazon and generic builds

src/amazon/java/org/tasks/preferences/BasicPreferences.java

@@ -11,7 +11,7 @@ public class BasicPreferences extends BaseBasicPreferences {
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
-        requires(false, R.string.synchronization, R.string.get_plugins);
+        requires(R.string.settings_general, false, R.string.synchronization);
     }
 
     @Override

src/generic/java/org/tasks/preferences/BasicPreferences.java

@@ -22,7 +22,7 @@ public class BasicPreferences extends BaseBasicPreferences {
             }
         });
 
-        requires(false, R.string.synchronization);
+        requires(R.string.settings_general, false, R.string.synchronization);
         requires(R.string.get_plugins, false, R.string.p_tesla_unread_enabled, R.string.p_purchased_tasker, R.string.p_purchased_dashclock);
         requires(R.string.privacy, false, R.string.p_collect_statistics);
     }