[BUG] Android - Asset Explorer - Rescanning Blockchain cannot be canceled

[cahlenlee]

Using 'Rescan Blockchain' in the Asset Explorer module cannot be canceled and the screen cannit be exited until the long scan is complete.

1. Launch Engram 0.5.2 on Android 13 (Pixel 4 XL)
2. Login to an existing wallet
3. Select 'Asset Explorer' module
4. Select 'My Assets'
5. Select 'Rescan Blockchain'
6. Attempt to cancel scan or leave screen

RESULT: Rescan cannot be canceled and the screen cannot be exited until scan completes

EXPECTED: Rescan can be stopped

https://github.com/DEROFDN/Engram/assets/30788194/4e123453-e79d-4922-8401-276c1af31ef5

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