account-assistant: make impl_signal_apply() behave more like impl_signal_prepare()
Fixes b.g.o#615734 current_page only seems to be == PAGE_ENTER_CREATE the first time you visit the page. After that, it has been seen to be 4 or larger. impl_signal_prepare() currently checks for >=, so I'm copying that, and also dealing with refs in the same way. This patch probably probably actually hides a bug in how current_page is set, because I can't see how it should be set >= 4 because the enum only goes up to 3. I'll look into that now, but the patch is tested and works.
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