ceph: helm: fix operator chart rbdGrpcMetricsPort
ceph: helm: fix operator chart rbdGrpcMetricsPort

This fixes the conditional for the `rbdGrpcMetricsPort` option.
Previously the `rbdGrpcMetricsPort` was useless as it was not used,
instead the Helm chart looked for `cephfsrbdGrpcMetricsPort` option.

Signed-off-by: Alexander Trost <88b6b84d9fa0dbf878e34ae3d402bc4895fcd37e@googlemail.com>

rook/rook,rook/rook,rook/nfs,rook/rook,rook/rook,rook/nfs,rook/rook,rook/nfs