Changed FPR admin to fluid layout.
Changed FPR admin to fluid layout.

refs #5535

Changed the FPR admin to a fluid layout for visual compatability with
the Archivematica dashboard.

artefactual/archivematica-fpr-admin,artefactual/archivematica-fpr-admin,artefactual/archivematica-fpr-admin,artefactual/archivematica-fpr-admin