patch 9.0.0337: flicker when resetting cmdline_row after updating the screen

Problem:    Flicker when resetting cmdline_row after updating the screen.
Solution:   Do not update cmdline_row. (issue #11017)

src/drawscreen.c

@@ -839,10 +839,6 @@ after_updating_screen(int may_resize_shell UNUSED)
     // handle the drop now.
     handle_any_postponed_drop();
 #endif
-
-    if (p_ch == 0)
-	// in case it was changed in dont_use_message_window()
-	cmdline_row = Rows;
 }
 
 /*

src/version.c

@@ -707,6 +707,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    337,
 /**/
     336,
 /**/