Remove erroneous local-workspace references.
Remove erroneous local-workspace references.

Bazel always interprets local build targets relative to the local workspace, so the syntax '@//' should only ever be necessary in the WORKSPACE file itself.

PiperOrigin-RevId: 280192871
Change-Id: I0230062f11b701f2d01b3e318615e86b5223c690

deepmind/labmaze,deepmind/labmaze