Return early if we ignore resize increments and aspect ratio constraints

Summary:
If we know that we are going to disobey resize increment and aspect ratio
geometry hints, then there is no point for trying to constrain the client
size according to those hints. Just return early.

Reviewers: #kwin, davidedmundson

Reviewed By: #kwin, davidedmundson

Subscribers: kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D27031