MTR: fix broken logic for ignoring missing ctest in Pushbuild

mysql-test/mysql-test-run.pl

@@ -5998,7 +5998,7 @@ sub run_ctest() {
   # Special override: also ignore in Pushbuild, some platforms may not have it
   # Now, run ctest and collect output
   my $ctest_out= `ctest $ctest_vs 2>&1`;
-  if ($? == $no_ctest && $opt_ctest == -1 && ! defined $ENV{PB2WORKDIR}) {
+  if ($? == $no_ctest && ($opt_ctest == -1 || defined $ENV{PB2WORKDIR})) {
     chdir($olddir);
     return;
   }