chore: prevent from clearing wallet data after restart #1366
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#857
Description
We've been clearing the wallet database on startup which forced scanning UTXOs from the tip 0 on every run. Scanning takes really long time each run:
Clearing was done when we had issues with view keys. Since it's gone, we can keep wallet dir and support caching.
How Has This Been Tested?
I tested manually by running the app several times and watching wallet logs(base_layer.log) to check whether wallet uses previously scanned blocks.
I also played with displaying seed words and importing new wallets to ensure everything is doesn't break anything related to the view keys