Fix event filters: switch default filter for invoice status
Fix event filters: switch default filter for invoice status

New default invoice status: None, ie. no filtering unless users
specifies it explicitly.

pbanaszkiewicz/amy,wking/swc-amy,wking/swc-amy,vahtras/amy,wking/swc-amy,pbanaszkiewicz/amy,vahtras/amy,swcarpentry/amy,pbanaszkiewicz/amy,swcarpentry/amy,wking/swc-amy,vahtras/amy,swcarpentry/amy