patch 8.2.0230: terminal popup test is flaky

Problem:    Terminal popup test is flaky.
Solution:   Increase wait time a bit.
diff --git a/src/testdir/test_terminal.vim b/src/testdir/test_terminal.vim
index 605ac06..0963405 100644
--- a/src/testdir/test_terminal.vim
+++ b/src/testdir/test_terminal.vim
@@ -2362,7 +2362,7 @@
   call term_sendkeys(buf, "\<C-W>:call HidePopup()\<CR>")
   call VerifyScreenDump(buf, 'Test_terminal_popup_4', {})
   call term_sendkeys(buf, "\<CR>")
-  call term_wait(buf, 50)
+  call term_wait(buf, 100)
 
   call term_sendkeys(buf, ":q\<CR>")
   call term_wait(buf, 100)  " wait for terminal to vanish