patch 8.2.3696: Vim9: error for invalid assignment when skipping

Problem:    Vim9: error for invalid assignment when skipping.
Solution:   Do not check white space when skipping. (closes #9243)
diff --git a/src/evalvars.c b/src/evalvars.c
index 9124848..4342100 100644
--- a/src/evalvars.c
+++ b/src/evalvars.c
@@ -881,7 +881,7 @@
 	    else
 		++expr;
 
-	    if (vim9script && (!VIM_ISWHITE(*argend)
+	    if (vim9script && !eap->skip && (!VIM_ISWHITE(*argend)
 						   || !IS_WHITE_OR_NUL(*expr)))
 	    {
 		vim_strncpy(op, expr - len, len);