patch 8.2.1305: some tests are still old style

Problem:    Some tests are still old style.
Solution:   Convert tests 52 and 70 to new style. (Yegappan Lakshmanan,
            closes #6544)  Fix error in FinishTesting().
diff --git a/src/testdir/runtest.vim b/src/testdir/runtest.vim
index 6cc7202..e42b0ca 100644
--- a/src/testdir/runtest.vim
+++ b/src/testdir/runtest.vim
@@ -447,7 +447,7 @@
   " - it fails again with the same message
   " - it fails five times (with a different message)
   if len(v:errors) > 0
-        \ $TEST_NO_RETRY == ''
+        \ && $TEST_NO_RETRY == ''
         \ && (index(s:flaky_tests, g:testfunc) >= 0
         \      || g:test_is_flaky)
     while 1