Fix bug breaking local builds.

This bug was reported by @nphilipp here https://bodhi.fedoraproject.org/updates/FEDORA-2018-c9c3a37d96

The issue is that the `record_filtered_rpms` method returns a new xmd
buildrequires block, but whole buildrequires entries were omitted in the return
value for local builds.  This one-liner includes them again.

module_build_service/utils/submit.py

@@ -59,6 +59,7 @@ def record_filtered_rpms(mmd):
         # In case this is module resubmit or local build, the filtered_rpms
         # will already be there, so there is no point in generating them again.
         if "filtered_rpms" in req_data:
+            new_buildrequires[req_name] = req_data
             continue
 
         # We can just get the first modulemd data from result right here thanks to