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

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

examples/event/index.rst

@@ -16,4 +16,4 @@ Event bubbling
 .. lv_example:: event/lv_example_event_3
   :language: c
 
-  
+

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))

examples/event/lv_example_event_2.py

@@ -7,7 +7,7 @@ def event_cb(e,label):
     elif code == lv.EVENT.LONG_PRESSED:
         label.set_text("The last button event:\nLV_EVENT_LONG_PRESSED")
     elif code == lv.EVENT.LONG_PRESSED_REPEAT:
-        label.set_text("The last button event:\nLV_EVENT_LONG_PRESSED_REPEAT")        
+        label.set_text("The last button event:\nLV_EVENT_LONG_PRESSED_REPEAT")
 btn = lv.btn(lv.scr_act())
 btn.set_size(100, 50)
 btn.center()

examples/event/lv_example_event_3.py

@@ -28,5 +28,5 @@ for i in range(30):
     label = lv.label(btn)
     label.set_text(str(i))
     label.center()
-    
+
 cont.add_event_cb(event_cb, lv.EVENT.CLICKED, None)