remove trailing space

lib/screenshooter-capture.c

@@ -1037,7 +1037,7 @@ static GdkPixbuf
  * Takes a screenshot with the given options. If @region is FULLSCREEN,
  * the screenshot is taken after @delay seconds. If @region is
  * ACTIVE_WINDOW, a delay of @delay seconds elapses, then the active
- * window is detected and captured. If @region is SELECT, the user will 
+ * window is detected and captured. If @region is SELECT, the user will
  * have to select a portion of the screen with the mouse. Then a delay of
  * @delay seconds elapses, and a screenshot is taken.
  *