tweaks: elide three checks of a shortcut's meta flag

A control code cannot be a Meta keystroke, and a plain printable
character as key code necessarily means it is a Meta keystroke.
So, comparing just the key code is enough.

src/global.c

@@ -443,10 +443,7 @@ size_t shown_entries_for(int menu)
 	return count;
 }
 
-/* Return the shortcut that corresponds to the values of kbinput (the
- * key itself) and meta_key (whether the key is a meta sequence).  The
- * returned shortcut will be the first in the list that corresponds to
- * the given sequence. */
+/* Return the first shortcut in the current menu that matches the given input. */
 const keystruct *get_shortcut(int *kbinput)
 {
 	/* Plain characters and upper control codes cannot be shortcuts. */
@@ -462,8 +459,7 @@ const keystruct *get_shortcut(int *kbinput)
 		return NULL;
 
 	for (keystruct *s = sclist; s != NULL; s = s->next) {
-		if ((s->menus & currmenu) && *kbinput == s->keycode &&
-										meta_key == s->meta)
+		if ((s->menus & currmenu) && *kbinput == s->keycode)
 			return s;
 	}
 

src/rcfile.c

@@ -823,8 +823,7 @@ void parse_binding(char *ptr, bool dobind)
 	assign_keyinfo(newsc, keycopy, keycode);
 
 	/* Disallow rebinding ^[ and frequent escape-sequence starter "Esc [". */
-	if ((!newsc->meta && newsc->keycode == ESC_CODE) ||
-				(newsc->meta && newsc->keycode == '[')) {
+	if (newsc->keycode == ESC_CODE || newsc->keycode == '[') {
 		jot_error(N_("Keystroke %s may not be rebound"), keycopy);
   free_things:
 		free(keycopy);