Can't toggle "Help distribute all new files" in public proxy but no notification

1. Rename `plugins/disabled-Multiuser` to `plugins/Multiuser` .
2. Restart ZeroNet.
3. Now if you drag out Sidebar and toggle "Help distribute all new files" button, a "This function is disabled on this proxy!" notification raise.
4. But if you switch to "FILES" tag in ZeroHello, toggle "Help distribute all new files" there, no notification
will raise.
5. Refresh page, you can see the "Help distribute all new files" option will keep the state after you toggle, wherever in ZeroHello and Sidebar.
6. In fact, the state of "Help distribute all new files" won't change.

Reproduce the issue by renaming plugins/disabled-Multiuser to plugins/Multiuser, restarting ZeroNet, and toggling the option in Sidebar and the ZeroHello FILES tag. Compare the two toggle paths; done means both show the disabled-proxy notification and neither falsely changes the persisted option state.

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