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_search_stat.vim b/src/testdir/test_search_stat.vim
index 3d60716..9bd2404 100644
--- a/src/testdir/test_search_stat.vim
+++ b/src/testdir/test_search_stat.vim
@@ -202,12 +202,12 @@
   END
   call writefile(lines, 'Xsearchstat')
   let buf = RunVimInTerminal('-S Xsearchstat', #{rows: 10})
-  call term_wait(buf)
+  call TermWait(buf)
   call VerifyScreenDump(buf, 'Test_searchstat_1', {})
 
   call term_sendkeys(buf, ":nnoremap <silent> n n\<cr>")
   call term_sendkeys(buf, "gg0n")
-  call term_wait(buf)
+  call TermWait(buf)
   call VerifyScreenDump(buf, 'Test_searchstat_2', {})
 
   call StopVimInTerminal(buf)