patch 8.2.3324: Vim9: Cannot use :silent with :endwhile

Problem:    Vim9: Cannot use :silent with :endwhile.
Solution:   Allow for using the :silent modifier. (closes #8737)
diff --git a/src/vim9compile.c b/src/vim9compile.c
index 6bb1090..127d5a6 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -2344,7 +2344,7 @@
 {
     isn_T	*isn;
 
-    if (has_cmdmod(cmod))
+    if (has_cmdmod(cmod, FALSE))
     {
 	cctx->ctx_has_cmdmod = TRUE;