commit entire output config, or fail and rollback

The wlr-output-management protocol requires that either all of the
changes from an apply request be applied successfully, in which case a
"succeeded" event is sent, or all of the changes are reverted and a
"failed" event is sent.  As written, this could partially commit
changes, then fail.

Test the changes first (even for an "apply" event), then commit or
rollback as appropriate.

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