Simple refactorings. Reduces flog from 1112 to 700 (~-37%). I can't
test this so I don't know if it works, but it should be straight up
algebraic substitutions for everything.

#params    263 ->   1
#[]        609 -> 442
assignment 161 -> 164
Merge pull request #954 from zenspider/refactoring

Simple refactorings for OpsController::Settings::Common#settings_get_form_vars. Reduces flog from 1112 to 700 (~-37%).