chore(style): remove the trailing space from all source files (#3188)

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

examples/event/lv_example_event_1.py

@@ -9,14 +9,14 @@ class Event_1():
         btn.set_size(100, 50)
         btn.center()
         btn.add_event_cb(self.event_cb, lv.EVENT.CLICKED, None)
-        
+
         label = lv.label(btn)
         label.set_text("Click me!")
         label.center()
 
     def event_cb(self,e):
         print("Clicked")
-            
+
         btn = e.get_target()
         label = btn.get_child(0)
         label.set_text(str(self.cnt))