patch 8.0.1823: test for terminal stdout redirection is flaky

Problem:    Test for terminal stdout redirection is flaky.
Solution:   Wait for the job to finish.

src/testdir/test_terminal.vim

@@ -1502,6 +1502,7 @@ func Test_terminal_out_err()
   call assert_equal("this is standard out", readfile(outfile)[0])
   call assert_equal('this is standard error', term_getline(buf, 1))
 
+  call WaitForAssert({-> assert_equal('dead', job_status(term_getjob(buf)))})
   exe buf . 'bwipe'
   call delete('Xechoerrout.sh')
   call delete(outfile)

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1823,
 /**/
     1822,
 /**/