patch 8.2.0533: tests using term_wait() can still be flaky

Problem:    Tests using term_wait() can still be flaky.
Solution:   Increase the wait time when rerunning a test. (James McCoy,
            closes #5899)  Halve the initial times to make tests run faster
            when there is no rerun.
diff --git a/src/testdir/test_match.vim b/src/testdir/test_match.vim
index 59098f7..cd8ae2e 100644
--- a/src/testdir/test_match.vim
+++ b/src/testdir/test_match.vim
@@ -289,7 +289,7 @@
   END
   call writefile(lines, 'XscriptMatchCommon')
   let buf = RunVimInTerminal('-S XscriptMatchCommon', #{rows: 12})
-  call term_wait(buf)
+  call TermWait(buf)
   return buf
 endfunc