simplify code 2

Simplify code in 
 - src/client/ot_otapi_ot.cpp
 - src/server/UserCommandProcessor.cpp
By moving the signing/saving of the contract out from the else/else if clauses, it is executed in case of `!bSuccessLoadingNymbox`. See the `if (!bSuccessLoadingNymbox)` clause, where before, the signing/saving was not executed, vs. now, where it is.