UI: Don't double-delete children of deleted widgets

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These widgets are all children of updateSettingsGroupBox, meaning they
get deleted when updateSettingsGroupBox gets deleted. This means that
the first two calls are unnecessary and the third one segfaults as
updateChannelLabel is gone already.
Just delete the parent widget instead.

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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f