tests: gstelement: Fix test_add_pad_while_paused flakiness
gst_element_remove_pad() doesn't automatically deactivate the pad, it has to
be done explicitly beforehand, otherwise the pad task might be left dangling,
exposed to undefined behaviour.
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gst_element_remove_pad() doesn't automatically deactivate the pad, it has to
be done explicitly beforehand, otherwise the pad task might be left dangling,
exposed to undefined behaviour.