patch 8.2.4928: various white space and cosmetic mistakes

Problem:    Various white space and cosmetic mistakes.
Solution:   Change spaces to tabs, improve comments.
diff --git a/src/menu.c b/src/menu.c
index 3c4236b..95f6fae 100644
--- a/src/menu.c
+++ b/src/menu.c
@@ -1638,7 +1638,7 @@
 	    modes = MENU_INSERT_MODE;
 	    break;
 	case 't':
-	    if (*cmd == 'l')            // tlmenu, tlunmenu, tlnoremenu
+	    if (*cmd == 'l')		// tlmenu, tlunmenu, tlnoremenu
 	    {
 		modes = MENU_TERMINAL_MODE;
 		++cmd;