Fix qt wallet hitting a debug_assert when creating blocks #3018
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This changes the block creation path of the Qt wallet to use the appropriate difficulty for work generation. By doing so, it fixes the assert reported in #3017.
The normal sending process (clicking Send in the wallet) and receive process (automatically) use the node wallet and thus the appropriate difficulty.
A test is added to make some epoch_2 validation where difficulty is different across block types. There is a similar test for the node internal wallet.