Fix modified Colocated MB type for B frame decoding direct prediction mode.
Fix modified Colocated MB type for B frame decoding direct prediction mode.

cisco/openh264,shihuade/openh264,shihuade/openh264,cisco/openh264,GuangweiWang/openh264,mstorsjo/openh264,ruil2/openh264,mstorsjo/openh264,shihuade/openh264,cisco/openh264,GuangweiWang/openh264,shihuade/openh264,cisco/openh264,GuangweiWang/openh264,ruil2/openh264,ruil2/openh264,ruil2/openh264,mstorsjo/openh264,cisco/openh264,shihuade/openh264,shihuade/openh264,mstorsjo/openh264,GuangweiWang/openh264,cisco/openh264,ruil2/openh264,cisco/openh264,shihuade/openh264,GuangweiWang/openh264,GuangweiWang/openh264,ruil2/openh264,mstorsjo/openh264,mstorsjo/openh264,GuangweiWang/openh264,mstorsjo/openh264,ruil2/openh264