fix: allow mover empty action without pools on 7.2

[elibosley]

Summary

• backport the mover empty-action fix to 7.2
• keep mover controls available when user shares are enabled but no pool devices exist
• label the no-pool action as Empty / Empty now so the UI reflects the supported operation
• preserve disabled behavior while parity, mover, or BTRFS operations are active

Root cause

The UI treated missing pool devices as a reason to disable or hide mover controls entirely. That blocked the array-disk empty workflow even though emptying an array disk can run without a configured pool.

Source

Cherry-picked from fd5251ad4fab628c5ea0800642d6b312da25ade9.

Verification

• php -l emhttp/plugins/dynamix/MoverSettings.page
• php -l emhttp/plugins/dynamix/ArrayOperation.page

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🔧 PR Test Plugin Available

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📝 Modified Files:

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emhttp/plugins/dynamix/ArrayOperation.page
emhttp/plugins/dynamix/MoverSettings.page

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