Janky Iceweasle Fork: Addonpocalypse Edition

• Fix AddonCollectionManager to not just use the first page of results (mozilla-mobile/android-components#8076)

Now add-ons won't suddenly become unsupported again because they dropped off the first page! Seeing as the add-on list is kind of the point, and the only reason you deal with this janky build, you should probably upgrade.