patch 8.0.1095: terminal multibyte escrape test is flaky

Problem:    Terminal multibyte escrape test is flaky.
Solution:   Add another condition to wait for.
diff --git a/src/testdir/test_terminal.vim b/src/testdir/test_terminal.vim
index b4268f5..4596d91 100644
--- a/src/testdir/test_terminal.vim
+++ b/src/testdir/test_terminal.vim
@@ -197,7 +197,7 @@
     let g:line = 1
   endif
 
-  call WaitFor('term_scrape(g:buf, g:line)[0].chars == "l"')
+  call WaitFor('len(term_scrape(g:buf, g:line)) >= 7 && term_scrape(g:buf, g:line)[0].chars == "l"')
   let l = term_scrape(g:buf, g:line)
   call assert_true(len(l) >= 7)
   call assert_equal('l', l[0].chars)