fix issue 1886: In CardBrowser filter cards by 'all' or 'any' of the selected tags.

In the [issue page](https://code.google.com/p/ankidroid/issues/detail?id=1886#makechanges), the post says "deck browser", but I believe it is actually "card browser" since I couldn't find any place to filter decks by tags (which doesn't make much sense to me anyway).

With this change, I added two radio buttons and the filter tag edittext to the dialog to search cards by tag. The radiobuttons are 'all' and 'any': if all, the cards filtered have all tags selected; if 'any', the cards filtered have at least one of the chosen tags.