UI: Fix redo recreating sources in the wrong scene

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Fixes an issue where if creating a new source was re-done from a
different scene, the source would be created first in that scene and
then OBS would switch to the scene where the source originally was
created.
Changes the order of these two operations, which makes OBS create the
source in the correct scene.

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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f