patch 9.0.0500: when quitting cmdline window with CTRL-C it remains visible

Problem:    When quitting the cmdline window with CTRL-C it remains visible.
Solution:   Redraw to avoid confusion. Adjust the error message.
            (closes #11152)  Adjust the cursor position after CTRL-C.
diff --git a/src/errors.h b/src/errors.h
index e293876..0882325 100644
--- a/src/errors.h
+++ b/src/errors.h
@@ -17,7 +17,7 @@
 	INIT(= N_("E10: \\ should be followed by /, ? or &"));
 #ifdef FEAT_CMDWIN
 EXTERN char e_invalid_in_cmdline_window[]
-	INIT(= N_("E11: Invalid in command-line window; <CR> executes, CTRL-C quits"));
+	INIT(= N_("E11: Invalid in command-line window; :q<CR> closes the window"));
 #endif
 EXTERN char e_command_not_allowed_from_vimrc_in_current_dir_or_tag_search[]
 	INIT(= N_("E12: Command not allowed from exrc/vimrc in current dir or tag search"));