Make alert only show on the current wallet being synced

[Duddino]

Abstract

Make the wallet synced alert only show when the current active wallet has been synced. (Previously the alert was bugged and not showing at all)
This required some changes:

• lockableFunctions will now return the awaiting promise instead of immediately returning false, so differents part of the code can await the same function without calling it multiple times
• Wallet::sync can be called any time, but it will return false if it has already been synced or there is no mk

Testing

• Test that the alert only shows when you have the wallet selected
• Try to create more wallets, and assert that the alert keeps showing

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[JSKitty]

tACK 438e3c5

Tested the sync alert flow on the deploy preview:

• Imported a mnemonic, waited for sync -- alert appeared after sync completed.
• Created a second account -- alert fired for the new account once synced.
• Switched back to account 0 -- no unexpected alert. All three cases correct.

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Claude Audit

Nit: dead .then(() => {}) in use_wallet.js:298

wallet.sync().then(() => {});

The empty .then() is a no-op leftover from before the alert moved to the Dashboard watch. Could just be wallet.sync();