patch 8.2.0839: dropping modifier when putting a character back in typeahead

Problem:    Dropping modifier when putting a character back in typeahead.
Solution:   Add modifier to ins_char_typebuf(). (closes #6158)
diff --git a/src/normal.c b/src/normal.c
index 690bb00..48e1c71 100644
--- a/src/normal.c
+++ b/src/normal.c
@@ -595,7 +595,7 @@
 	// restart automatically.
 	// Insert the typed character in the typeahead buffer, so that it can
 	// be mapped in Insert mode.  Required for ":lmap" to work.
-	ins_char_typebuf(c);
+	ins_char_typebuf(vgetc_char, vgetc_mod_mask);
 	if (restart_edit != 0)
 	    c = 'd';
 	else