UI: Add undo/redo to Paste Filters on audio mixer and scenes

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Copy-Pasting filters on a scene or on a source via the audio mixer
context menu would not add an undo/redo action. This commit factors the
undo/redo logic out into a generic paste filters function that can be
used for pasting filters everywhere.

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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f