Fix 'is_chained' value for final rule in chain
Fix 'is_chained' value for final rule in chain

'is_chained' should be true for an actionset when the is_chained
member of the struct is true, or when its rule has a valid
chain_starter member.

csanders-git/ModSecurity,phpModSecurity/ModSecurity,bjh7242/ModSecurity,p0pr0ck5/ModSecurity,irtnog/ModSecurity,irtnog/ModSecurity,csanders-git/ModSecurity,marcstern/ModSecurity,marcstern/ModSecurity,csanders-git/ModSecurity,p0pr0ck5/ModSecurity,marcstern/ModSecurity,marcstern/ModSecurity,bjh7242/ModSecurity,csanders-git/ModSecurity,bjh7242/ModSecurity,p0pr0ck5/ModSecurity,csanders-git/ModSecurity,p0pr0ck5/ModSecurity,bjh7242/ModSecurity,p0pr0ck5/ModSecurity,p0pr0ck5/ModSecurity,marcstern/ModSecurity,bjh7242/ModSecurity,irtnog/ModSecurity,irtnog/ModSecurity,bjh7242/ModSecurity,irtnog/ModSecurity,csanders-git/ModSecurity,irtnog/ModSecurity