Potentially fix sync bug

[Duddino]

Abstract

There has been a report of MPW reporting an incorrect balance and having transaction fail.
This user had a substantial amount of PIVs in cold stake, resyncing the wallet seems to correct the issue. While we weren't able to confirm what happened, here is a potential reason:

• MPW received a stake reward, just as the user was syncing/had the wallet open
• A better chain was found, and the node forked and picked up the new one
• MPW never realizes this and keeps the non existant reward, leading to an incorrect balance and unable to make transactions.

To fix this, MPW will simply not save a transaction to the database if it's too young (Configurable via chain_params)

Testing

• Test that MPW syncs as usual without issues

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[JSKitty]

Several issues:

• I see no confirmsForSaving param anywhere in our chainparams.
• Due to the above, Sent TXs are not persisting to IndexedDB, so if you immediately refresh, the Tx will be gone (until synced back via explorer).
• When sending a Tx, the "Time" is using Unix(0), thus displaying as "1 Jan 70".