When editing an existing SMB share, changing the "Purpose" visibly changes, but when saving it does not actually seem to apply.

1. Create an SMB share.
2. Once created, open the edit modal and switch the "Purpose" to something like "Multi-user time machine".
3. Save the share.
4. Edit the share again and notice that the purpose didn't actually change.

Additionally, this error appears in the console when switching the purpose dropdown:

```
TypeError: Cannot read properties of null (reading 'enable')
at $.clearPresets (3495.685bb8eda4ba3810.js:1:67603)
at Object.next (3495.685bb8eda4ba3810.js:1:66133)
at L.next (main.f48246f5e1f86a8a.js:1:1725755)
at P._next (main.f48246f5e1f86a8a.js:1:1725428)
at P.next (main.f48246f5e1f86a8a.js:1:1725118)
at L.next (main.f48246f5e1f86a8a.js:1:1725755)
at P._next (main.f48246f5e1f86a8a.js:1:1725428)
at P.next (main.f48246f5e1f86a8a.js:1:1725118)
at main.f48246f5e1f86a8a.js:1:1723063
at u (main.f48246f5e1f86a8a.js:1:1753585)
at bs.next (main.f48246f5e1f86a8a.js:1:1722902)
at bs.emit (main.f48246f5e1f86a8a.js:1:2111738)
at oi.updateValueAndValidity (main.f48246f5e1f86a8a.js:1:2266020)
at oi.setValue (main.f48246f5e1f86a8a.js:1:2277400)
at Ut (main.f48246f5e1f86a8a.js:1:2273774)
at J.onChange (main.f48246f5e1f86a8a.js:1:2271932)
at main.f48246f5e1f86a8a.js:1:417997
at lv (main.f48246f5e1f86a8a.js:1:2143086)
at Object.M [as next] (main.f48246f5e1f86a8a.js:1:2143304)
at L.next (main.f48246f5e1f86a8a.js:1:1725755)
at P._next (main.f48246f5e1f86a8a.js:1:1725428)
at P.next (main.f48246f5e1f86a8a.js:1:1725118)
at main.f48246f5e1f86a8a.js:1:1723063
at u (main.f48246f5e1f86a8a.js:1:1753585)
at bs.next (main.f48246f5e1f86a8a.js:1:1722902)
at bs.emit (main.f48246f5e1f86a8a.js:1:2111738)
at Oe.viewToModelUpdate (main.f48246f5e1f86a8a.js:1:2279975)
at Ut (main.f48246f5e1f86a8a.js:1:2273831)
at Yt._onChange (main.f48246f5e1f86a8a.js:1:2271932)
at Yt._propagateChanges (main.f48246f5e1f86a8a.js:1:2882939)
at Yt._onSelect (main.f48246f5e1f86a8a.js:1:2882522)
at Object.next (main.f48246f5e1f86a8a.js:1:2881827)
at L.next (main.f48246f5e1f86a8a.js:1:1725755)
at P._next (main.f48246f5e1f86a8a.js:1:1725428)
at P.next (main.f48246f5e1f86a8a.js:1:1725118)
at subscribe.y (main.f48246f5e1f86a8a.js:1:1741968)
at u._next (main.f48246f5e1f86a8a.js:1:1734581)
at u.next (main.f48246f5e1f86a8a.js:1:1725118)
at subscribe.J (main.f48246f5e1f86a8a.js:1:1738583)
at u._next (main.f48246f5e1f86a8a.js:1:1734581)
at u.next (main.f48246f5e1f86a8a.js:1:1725118)
at L.next (main.f48246f5e1f86a8a.js:1:1725755)
at P._next (main.f48246f5e1f86a8a.js:1:1725428)
at P.next (main.f48246f5e1f86a8a.js:1:1725118)
at main.f48246f5e1f86a8a.js:1:1723063
at u (main.f48246f5e1f86a8a.js:1:1753585)
at bs.next (main.f48246f5e1f86a8a.js:1:1722902)
at bs.emit (main.f48246f5e1f86a8a.js:1:2111738)
at ze._emitSelectionChangeEvent (main.f48246f5e1f86a8a.js:1:2518581)
at ze._selectViaInteraction (main.f48246f5e1f86a8a.js:1:2518171)
```

Host ID: 3c1040d5fec54e9ebdebd7f4649576d29e0dcd2b7ccc55b81961e64480a69cc7

Session ID: d6a5bfb3-c360-1b6f-c7ed-1778cc596596