patch 8.2.1671: Vim9: stray error for missing white space

Problem:    Vim9: stray error for missing white space.
Solution:   Do not skip over white space after member. (closes #6817)
diff --git a/src/eval.c b/src/eval.c
index 6283fdf..3e972a2 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -3586,7 +3586,7 @@
 	    ;
 	if (keylen == 0)
 	    return FAIL;
-	*arg = skipwhite(key + keylen);
+	*arg = key + keylen;
     }
     else
     {