bump SeaMonkey version for 2.0b1pre cycle on default branch, a=seamonkey-council

suite/app/module.ver

@@ -1,7 +1,7 @@
 WIN32_MODULE_COMPANYNAME=mozilla.org
 WIN32_MODULE_COPYRIGHT=©Mozilla Developers, according to the MPL 1.1/GPL 2.0/LGPL 2.1 licenses, as applicable.
 WIN32_MODULE_PRODUCTVERSION=2,0,0,0
-WIN32_MODULE_PRODUCTVERSION_STRING=2.0a1pre
+WIN32_MODULE_PRODUCTVERSION_STRING=2.0b1pre
 WIN32_MODULE_TRADEMARKS=SeaMonkey and Mozilla are trademarks of The Mozilla Foundation.
 WIN32_MODULE_DESCRIPTION=@MOZ_APP_DISPLAYNAME@
 WIN32_MODULE_PRODUCTNAME=@MOZ_APP_DISPLAYNAME@