Refs #3809 - Remove rubocop TODOs

Removed the following TODOs so that cops for these will run from now on:

Lint/AmbiguousOperator, DefEndAlignment, DeprecatedClassMethods
EnsureReturn, RequireParentheses, Void, BlockAlignment, EndAlignment,
UselessAccessModifier,

Style/IndentArray, IndentHash, Tab, UnlessElse, UnneededPercentQ, UnneededPercentX, RedundantReturn

Rails/Validation
I think in this case it makes the first few lines very long. In any case the cop this fixes had to do with the indentation of the ```if else``` block.