fix missing dictionary conversion in URIMatcher.get_next_entry.

In yesterday's patch (63030ca2f2630b46acfbb27916f80b93a75b1c68), I missed one conversion from self.current_entries --> self.current_entries[method]. This affected the order of returned results. If two responses were registered, a and b, then the return order was: 

a
b
b
a
b
b
a
...

This patch fixes the order to be as expected. 
a
b
b
b
...