Removed `mineWhenNeeded` condition
Removed `mineWhenNeeded` condition

Removed a condition that detects if `mineWhenNeeded === true`. While reaslistically, the `defaultAccount` will only be populated when `mineWhenNeeded` is set, there is no need to check for this when falling back to the blockchain account.

iurimatias/embark-framework,iurimatias/embark-framework