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_number.vim b/src/testdir/test_number.vim
index fef187b..17a1e35 100644
--- a/src/testdir/test_number.vim
+++ b/src/testdir/test_number.vim
@@ -280,7 +280,7 @@
 
   " Check that the balloon shows up after a mouse move
   let buf = RunVimInTerminal('-S XTest_relnr', {'rows': 10, 'cols': 50})
-  call term_wait(buf, 100)
+  call TermWait(buf, 50)
   " Default colors
   call VerifyScreenDump(buf, 'Test_relnr_colors_1', {})