Rolling back Bio-Formats submodule pointer

Upgrading via the job failed the OMERO-trunk build:

```
/home/hudson/.hudson/jobs/OMERO-trunk/workspace/src/components/blitz/src/ome/formats/OMEROMetadataStoreClient.java:225:
ome.formats.OMEROMetadataStoreClient is not abstract and does not
override abstract method setXMLAnnotationAnnotator(java.lang.String,int)
in loci.formats.meta.MetadataStore
public class OMEROMetadataStoreClient
```

/cc @rleigh-dundee, @qidane, @melissalinkert

Assuming travis is happy and gretzky2 builds, I'll likely merge immediately.