[ci] pmd-regression-tester - disable exit immediately for uploading baseline

See also pmd/pmd-regression-tester#40
It fails at the very last step (determining result code), so
the baseline is created and can be uploaded.

.travis/build-deploy.sh

@@ -117,6 +117,8 @@ elif travis_isPush; then
 
 
     (
+        # disable fast fail, exit immediately, in this subshell
+        set +e
 
         upload_baseline