Refactor if-blocks

Group all conditions requiring a controller in a single if-block.

app/src/input_manager.c

@@ -707,13 +707,14 @@ sc_input_manager_process_mouse_button(struct sc_input_manager *im,
 
     bool down = event->type == SDL_MOUSEBUTTONDOWN;
     if (!im->forward_all_clicks) {
+        if (controller) {
             enum sc_action action = down ? SC_ACTION_DOWN : SC_ACTION_UP;
 
-        if (controller && event->button == SDL_BUTTON_X1) {
+            if (event->button == SDL_BUTTON_X1) {
                 action_app_switch(controller, action);
                 return;
             }
-        if (controller && event->button == SDL_BUTTON_X2 && down) {
+            if (event->button == SDL_BUTTON_X2 && down) {
                 if (event->clicks < 2) {
                     expand_notification_panel(controller);
                 } else {
@@ -721,14 +722,15 @@ sc_input_manager_process_mouse_button(struct sc_input_manager *im,
                 }
                 return;
             }
-        if (controller && event->button == SDL_BUTTON_RIGHT) {
+            if (event->button == SDL_BUTTON_RIGHT) {
                 press_back_or_turn_screen_on(controller, action);
                 return;
             }
-        if (controller && event->button == SDL_BUTTON_MIDDLE) {
+            if (event->button == SDL_BUTTON_MIDDLE) {
                 action_home(controller, action);
                 return;
             }
+        }
 
         // double-click on black borders resize to fit the device screen
         if (event->button == SDL_BUTTON_LEFT && event->clicks == 2) {