gamma-control-v1: fix handling of duplicate control

When a new client comes in and tries to create a
zwlr_gamma_control_v1 object for an output which already has one,
we were destroying the old object and early-returning. The early
return causes the new object to not be set up properly: it's not
inserted in the list and doesn't get the gamma_size event.

Fix this by destroying the new object, and leave the old object
intact, which is what was the intent I think.

Closes: https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/3605

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