patch 8.2.4454: resetting cmdwin_type only for one situation

Problem:    Resetting cmdwin_type only for one situation.
Solution:   Reset cmdwin_type before closing windows. (closes #9822)

src/testdir/test_exit.vim

@@ -119,6 +119,7 @@ func Test_exit_error_reading_input()
   call writefile([":au VimLeave * call writefile(['l = ' .. v:exiting], 'Xtestout')", ":tabnew", "q:"], 'Xscript', 'b')
 
   if RunVim([], [], '<Xscript')
+    call assert_equal(1, v:shell_error)
     call assert_equal(['l = 1'], readfile('Xtestout'))
   endif
   call delete('Xscript')

src/ui.c

@@ -1065,9 +1065,6 @@ read_error_exit(void)
     if (silent_mode)	// Normal way to exit for "ex -s"
 	getout(0);
     STRCPY(IObuff, _("Vim: Error reading input, exiting...\n"));
-#ifdef FEAT_CMDWIN
-    cmdwin_type = 0;
-#endif
     preserve_exit();
 }
 

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4454,
 /**/
     4453,
 /**/

src/window.c

@@ -2856,6 +2856,10 @@ win_free_all(void)
 {
     int		dummy;
 
+#ifdef FEAT_CMDWIN
+    // avoid an error for switching tabpage with the cmdline window open
+    cmdwin_type = 0;
+#endif
     while (first_tabpage->tp_next != NULL)
 	tabpage_close(TRUE);