[Bug 762124] input-selector: remove some dead code

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=762124

--- Comment #2 from Tim-Philipp Müller <t.i.m at zen.co.uk> ---
It's relevant when a RESYNC happens (e.g. someone adds a new pad while we're
iterating).

We could also just take the lock, iterate the list and not use iterator at all
;)

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