XDOODLE-37: Auto-refresh the poll count after save

[evalica]

Tested on 10.6 with XPoll 1.9.3
Issue: https://jira.xwiki.org/browse/XDOODLE-37

Currently you need to refresh the page manually to see the count change. The Save button gets disabled until the page refresh.

[CostiChD]

Would you like to refresh the whole page or just the table ?

[acotiuga]

I would say we should refresh only the table, for a better user experience.