Correct default_atypes to match what's generated

Correct default_atypes to match what's generated

Kevin Monceaux reported a regression with the 2.4 release. Running
with the -a/--alert option and no limited --atypes or atypes
override in weatherrc resulted in a message about undefined URLs
and no normal output. This problem crept in when hard-coding alert
types in the correlator after ditching the woefully unmaintained
zonecatalog.curr.tar data source (commit 8a37edd).

Update default_atypes so that it covers all relevant non-forecast
URLs the correlate routine embeds.