ext4: drop read-only check in ext4_init_inode_table()

We better should not be initializing inode tables on read-only
filesystem. The following transaction start will warn us and make the
function bail anyway so drop the pointless check.

Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20230616165109.21695-8-jack@suse.cz


Signed-off-by: Theodore Ts'o <tytso@mit.edu>