Issue 1821:Tags limited to numeric values

Fixing the bug in the custom study details section where selecting to create a custom study deck by tags would show a dialog requesting a number, rather than a list of tags.

Here's the bug report:
https://code.google.com/p/ankidroid/issues/detail?id=1821&q=tag&colspec=ID%20Type%20Priority%20Status%20Milestone%20Owner%20Summary