patch 8.2.1496: Vim9: cannot use " #" in a mapping

Problem:    Vim9: cannot use " #" in a mapping.
Solution:   Do not remove a comment with the EX_NOTRLCOM flag. (closes #6746)
diff --git a/src/vim9compile.c b/src/vim9compile.c
index 00572e3..025e8cb 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -6251,6 +6251,7 @@
 	    usefilter = TRUE;
 	if ((argt & EX_TRLBAR) && !usefilter)
 	{
+	    eap->argt = argt;
 	    separate_nextcmd(eap);
 	    if (eap->nextcmd != NULL)
 		nextcmd = eap->nextcmd;