patch 8.2.1326: Vim9: skipping over white space after list

Problem:    Vim9: skipping over white space after list.
Solution:   Do not skip white space, a following [] would be misinterpreted.
            (closes #6552)  Fix a few side effects.
diff --git a/src/testdir/test_popupwin.vim b/src/testdir/test_popupwin.vim
index 00b956a..30dfc66 100644
--- a/src/testdir/test_popupwin.vim
+++ b/src/testdir/test_popupwin.vim
@@ -588,7 +588,7 @@
 	call setline(1, range(100))
 	for nr in range(7)
 	  call setline(nr * 12 + 1, "fold {{{")
-	  call setline(nr * 12 + 11 , "end }}}")
+	  call setline(nr * 12 + 11, "end }}}")
 	endfor
 	%foldclose
 	set shell=/bin/sh noruler