Fix Double sync

[panleone]

Abstract

Solves two bugs:

1. Do not re-loadFromDisk and re-fullSync an already loaded loaded (this happened for example when wallet was unlocked);
2. Disable togglet testnet and delete wallet if the wallet is not synced yet, or everything will break down.

2. This is also a solution to Switching networks is buggy #202 . The solution is not very clean but until we do a big refactor of wallet/mempool/network this is the best we can do.

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[JSKitty]

tACK 0675e83, good to have even a simple temporary solution to the failed network reqs when switching chains halfway through sync (especially effective now we store on disk for instant reloads).

[Liquid369]

tACK 0675e83

[Duddino]

tACK