change translation of if-statement to not rely on optimizer for readable output

[gauravpartha]

Previously, the translated condition in the if-statement translation was computed by the Scala expression allStateAssms ==> transalteExpInWand(cond). In the standard case, allStateAssms is set to true and Carbon's Boogie optimizer gets rid of the implication's left hand side.

Now, the translated condition is computed such that if allStateAssms is true, then the left hand side is removed direcly without requiring the optimizer. This produces more readable output when doing experiments where the optimizer is switched off.