patch 8.2.4099: Vim9: cannot use Vim9 syntax in mapping

Problem:    Vim9: cannot use Vim9 syntax in mapping.
Solution:   Add <ScriptCmd> to use the script context for a command.
diff --git a/src/terminal.c b/src/terminal.c
index 281c673..f32d3ad 100644
--- a/src/terminal.c
+++ b/src/terminal.c
@@ -2229,7 +2229,8 @@
 	    break;
 
 	case K_COMMAND:
-	    return do_cmdline(NULL, getcmdkeycmd, NULL, 0);
+	case K_SCRIPT_COMMAND:
+	    return do_cmdkey_command(c, 0);
     }
     if (typed)
 	mouse_was_outside = FALSE;