RuboCop: pretty up role_override.rb
RuboCop: pretty up role_override.rb

unwrap account_allows lambdas, and start the hash on a fresh line
so it doesn't end up far-right

Change-Id: I2d988210fe440af9c380e9c3c15f49f8b154ed87
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/274216
Reviewed-by: August Thornton <9adc7a1161ddf32ff608de792a7e50179545f026@instructure.com>
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
QA-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
Product-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>

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