Fix handling of encoding change
Fix handling of encoding change

prepare/netsurf_libhubbub,Achal-Aggarwal/hibbub,prepare/netsurf_libhubbub,Achal-Aggarwal/hibbub,prepare/netsurf_libhubbub,prepare/netsurf_libhubbub,Achal-Aggarwal/hibbub,Achal-Aggarwal/hibbub,prepare/netsurf_libhubbub,prepare/netsurf_libhubbub