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

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

examples/widgets/textarea/index.rst

@@ -4,14 +4,14 @@ Simple Text area
 
 .. lv_example:: widgets/textarea/lv_example_textarea_1
   :language: c
-      
-      
-Text area with password field 
+
+
+Text area with password field
 """""""""""""""""""""""""""""
 
 .. lv_example:: widgets/textarea/lv_example_textarea_2
   :language: c
-      
+
 Text auto-formatting
 """""""""""""""""""""""""""""
 

examples/widgets/textarea/lv_example_textarea_1.py

@@ -23,7 +23,7 @@ btnm_map = ["1", "2", "3", "\n",
             "4", "5", "6", "\n",
             "7", "8", "9", "\n",
             lv.SYMBOL.BACKSPACE, "0", lv.SYMBOL.NEW_LINE, ""]
-         
+
 btnm = lv.btnmatrix(lv.scr_act())
 btnm.set_size(200, 150)
 btnm.align(lv.ALIGN.BOTTOM_MID, 0, -10)

examples/widgets/textarea/lv_example_textarea_3.py

@@ -14,7 +14,7 @@ def ta_event_cb(e):
         rest = txt[colon_pos:]
         if len(rest) > 3:
             ta.del_char()
-            
+
     if len(txt) < 2:
         return
     if ":" in txt: