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_startup.vim b/src/testdir/test_startup.vim
index f532c43..5eff1bd 100644
--- a/src/testdir/test_startup.vim
+++ b/src/testdir/test_startup.vim
@@ -795,9 +795,9 @@
   let cmd = GetVimCommandCleanTerm() . ' -u Xvimrc_missing -S Xafter'
   let buf = term_start(cmd, {'term_rows' : 10})
   call WaitForAssert({-> assert_equal("running", term_getstatus(buf))})
-  call term_wait(buf)
+  call TermWait(buf)
   call term_sendkeys(buf, "\n:")
-  call term_wait(buf)
+  call TermWait(buf)
   call WaitForAssert({-> assert_match(':', term_getline(buf, 10))})
   call StopVimInTerminal(buf)
   call assert_equal([], readfile('Xtestout'))