wallet2: fix sending a rct tx with a single output available

This would have tried to send a second output to make the tx
look like the 2/2 ideal, but it would not fail to find one
because picking an output from preferred_inputs priority list
did not remove it from the unused tranfer/dust outputs, so
it would try to send the same output twice.

While there, I also added a check to avoid sending a second
input if it's related to the first. Better 1/2 than linking
inputs, I think.

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