UI: Don't try to make OBSBasic parent of ControlsSplitButton

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Passing the parent of a QLayout sets it directly as the top-level layout
(as per the QLayout docs). This is obviously not what is intended here.
Luckily it doesn't even work since the main window of course already has
a layout which would need to be explicitly removed before, but it makes
Qt yell at us for trying.

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