patch 9.1.0716: resetting setcellwidth() doesn't update the screen

Problem:  resetting setcellwidth() doesn't update the screen
Solution: Redraw after clearing the cellwidth table (Ken Takata)

closes: #15628

Signed-off-by: Ken Takata <kentkt@csc.jp>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/mbyte.c b/src/mbyte.c
index d8c47ac..fa67032 100644
--- a/src/mbyte.c
+++ b/src/mbyte.c
@@ -5644,7 +5644,7 @@
 	// Clearing the table.
 	VIM_CLEAR(cw_table);
 	cw_table_size = 0;
-	return;
+	goto done;
     }
 
     ptrs = ALLOC_MULT(listitem_T *, l->lv_len);
@@ -5756,6 +5756,7 @@
     }
 
     vim_free(cw_table_save);
+done:
     changed_window_setting_all();
     redraw_all_later(UPD_CLEAR);
 }