patch 8.0.1216: tabline is not always updated for :file command

Problem:    Tabline is not always updated for :file command. (Norio Takagi)
Solution:   Set redraw_tabline. (Hirohito Higashi)

src/ex_cmds.c

@@ -3002,6 +3002,7 @@ ex_file(exarg_T *eap)
     /* print full file name if :cd used */
     if (!shortmess(SHM_FILEINFO))
 	fileinfo(FALSE, FALSE, eap->forceit);
+    redraw_tabline = TRUE;
 }
 
 /*

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1216,
 /**/
     1215,
 /**/