ReaderSearch: Switch to a real InputDialog (#7360)
ReaderSearch: Switch to a real InputDialog (#7360)

Instead of piggybacking on InputContainer's onInput trickery for hold_input & tap_input.

Also, don't flag the buttons from that InputDialog as vsync, because that was stupid ;).

Fix #7357
Hzj-jie/koreader,Frenzie/koreader,koreader/koreader,mwoz123/koreader,Frenzie/koreader,NiLuJe/koreader,koreader/koreader,poire-z/koreader,poire-z/koreader,NiLuJe/koreader