patch 8.2.0611: Vim9: no check for space before #comment

Problem:    Vim9: no check for space before #comment.
Solution:   Add space checks.
diff --git a/src/eval.c b/src/eval.c
index 94ecf93..43c2008 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -1773,7 +1773,7 @@
 
     p = skipwhite(arg);
     ret = eval1(&p, rettv, evaluate);
-    if (ret == FAIL || !ends_excmd(*p))
+    if (ret == FAIL || !ends_excmd2(arg, p))
     {
 	if (ret != FAIL)
 	    clear_tv(rettv);