[IMPROVEMENT] Remove redundant `await` on synchronous `userPreferences.getBool` in `getUsersPresence`

[cynicalmindset]

Description:

In app/lib/methods/getUsersPresence.ts, the setPresenceCap function contains an unnecessary await when calling userPreferences.getBool(NOTIFICATION_PRESENCE_CAP).

UserPreferences is backed by react-native-mmkv, where getBool(key) is completely synchronous and returns boolean | null (not a Promise). Awaiting a synchronous non-Promise value is redundant, flags @typescript-eslint/await-thenable, and adds unnecessary microtask overhead to an otherwise synchronous routine.

Environment Information:

• Rocket.Chat Server Version: N/A (Client TypeScript codebase)
• Rocket.Chat App Version: develop branch
• Device Name: All
• OS Version: iOS / Android

Steps to reproduce:

1. Open app/lib/methods/getUsersPresence.ts lines 140–151.
2. Note that userPreferences.getBool is called with await.
3. Check definition of userPreferences.getBool in app/lib/methods/userPreferences.ts: it synchronously returns boolean | null.

Expected behavior:

userPreferences.getBool(NOTIFICATION_PRESENCE_CAP) should be evaluated synchronously without await. Since all internal operations in setPresenceCap are synchronous, the async modifier should also be removed.

Actual behavior:

A non-Promise return value (boolean | null) is awaited using await, and setPresenceCap is unnecessarily declared as async.

Proposed Solution & Approach:

1. In app/lib/methods/getUsersPresence.ts, remove await on line 142.
2. Remove async keyword from setPresenceCap on line 140.
3. Verify that pnpm lint (oxlint && tsc) passes without errors.

Additional context:

All external callers in the codebase (app/lib/methods/getSettings.ts line 186 and app/lib/services/connect.ts line 349) already invoke setPresenceCap(...) synchronously without await. Making setPresenceCap strictly synchronous aligns the implementation with its callers and avoids microtask scheduling.