fix : modify volume access mode 'ROM' to 'ROX'.

Created by: 123liubao

Signed-off-by: 123liubao chenly_61@163.com

What type of PR is this?

/kind bug

What this PR does / why we need it:

The storage volume access mode display error , the 'RWM' have been updated to 'RWX'. This PR is to modify 'ROM' to 'ROX'.

Which issue(s) this PR fixes:

Fixes https://github.com/kubesphere/kubesphere/issues/4509

Does this PR introduced a user-facing change?

None

Additional documentation, usage docs, etc.: