patch 9.1.1277: tests: trailing comment char in test_popupwin

Problem:  tests: trailing comment char in test_popupwin
Solution: remove crufty tail comment (Doug Kearns)

Remove a crufty tail comment from Test_popup_with_border_and_padding().
The line used to be in a string list and the closing quote and comma
persist.

closes: #17058

Signed-off-by: Doug Kearns <dougkearns@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_popupwin.vim b/src/testdir/test_popupwin.vim
index 5082676..3c8e5d7 100644
--- a/src/testdir/test_popupwin.vim
+++ b/src/testdir/test_popupwin.vim
@@ -148,7 +148,7 @@
 	\ lastline: 1,
 	\ scrollbar: 0,
 	\ visible: 1}
-  let winid = popup_create('hello border', #{line: 2, col: 3, border: []})",
+  let winid = popup_create('hello border', #{line: 2, col: 3, border: []})
   call assert_equal(with_border_or_padding, winid->popup_getpos())
   let options = popup_getoptions(winid)
   call assert_equal([], options.border)