libobs: Fix loading of custom_size for empty scenes

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Previously, `custom_size` was checked at the end of the `scene_load`
function. If the scene contained no "items" array, the `custom_scene`
loading code would never be run.

This moves the `custom_size` code above the return statement.

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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f