plugin_screen don't save settings on every plugin execution

we shouldn't need to save the last_screen unless the plugin were to
bypass the normal shutdown procedure

if its a crash do we really want to resume the plugin?
its it is intentional save the settings prior.

Change-Id: I994ed256e7b9e88add0c846825a39b298e2644dd

apps/root_menu.c

@@ -715,7 +715,7 @@ static int load_plugin_screen(char *key)
     int old_global = global_status.last_screen;
     last_screen = next_screen;
     global_status.last_screen = (char)next_screen;
-    status_save();
+    /*status_save(); //only needed if we crash */
 
     while(loops-- > 0) /* just to keep things from getting out of hand */
     {