bcachefs: Run may_delete_deleted_inode() checks in bch2_inode_rm()

We had a bug where bch2_evict_inode() incorrectly called bch2_inode_rm()
- the journal clearly showed the inode was not unlinked.

We've got checks that we use in recovery when cleaning up deleted
inodes, lift them to bch2_inode_rm() as well.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>