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_vimscript.vim b/src/testdir/test_vimscript.vim
index f9df09b..69c9f56 100644
--- a/src/testdir/test_vimscript.vim
+++ b/src/testdir/test_vimscript.vim
@@ -1913,30 +1913,30 @@
 
   " Deep nesting of if ... endif
   call term_sendkeys(buf, ":call Test1()\n")
-  call term_wait(buf)
+  call TermWait(buf)
   call WaitForAssert({-> assert_match('^E579:', term_getline(buf, 5))})
 
   " Deep nesting of for ... endfor
   call term_sendkeys(buf, ":call Test2()\n")
-  call term_wait(buf)
+  call TermWait(buf)
   call WaitForAssert({-> assert_match('^E585:', term_getline(buf, 5))})
 
   " Deep nesting of while ... endwhile
   call term_sendkeys(buf, ":call Test3()\n")
-  call term_wait(buf)
+  call TermWait(buf)
   call WaitForAssert({-> assert_match('^E585:', term_getline(buf, 5))})
 
   " Deep nesting of try ... endtry
   call term_sendkeys(buf, ":call Test4()\n")
-  call term_wait(buf)
+  call TermWait(buf)
   call WaitForAssert({-> assert_match('^E601:', term_getline(buf, 5))})
 
   " Deep nesting of function ... endfunction
   call term_sendkeys(buf, ":call Test5()\n")
-  call term_wait(buf)
+  call TermWait(buf)
   call WaitForAssert({-> assert_match('^E1058:', term_getline(buf, 4))})
   call term_sendkeys(buf, "\<C-C>\n")
-  call term_wait(buf)
+  call TermWait(buf)
 
   "let l = ''
   "for i in range(1, 6)