vl_test_twister.m: minor fix
vl_test_twister.m: minor fix

rxl194/vlfeat,CansenJIANG/vlfeat,WangDequan/vlfeat,rxl194/vlfeat,CansenJIANG/vlfeat,cvfish/vlfeat,cvfish/vlfeat,cvfish/vlfeat,rxl194/vlfeat,erexhepa/vlfeat,j-bo/vlfeat,WangDequan/vlfeat,qubick/vlfeat,rxl194/vlfeat,mylxiaoyi/vlfeat,j-bo/vlfeat,WangDequan/vlfeat,CansenJIANG/vlfeat,WangDequan/vlfeat,mylxiaoyi/vlfeat,CansenJIANG/vlfeat,vlfeat/vlfeat,mylxiaoyi/vlfeat,WangDequan/vlfeat,vlfeat/vlfeat,vlfeat/vlfeat,rxl194/vlfeat,qubick/vlfeat,hongzhili/vlfeat,qubick/vlfeat,erexhepa/vlfeat,mylxiaoyi/vlfeat,richarddzh/vlfeat,j-bo/vlfeat,CansenJIANG/vlfeat,cvfish/vlfeat,qubick/vlfeat,hongzhili/vlfeat,richarddzh/vlfeat,richarddzh/vlfeat,erexhepa/vlfeat,rxl194/vlfeat,richarddzh/vlfeat,hongzhili/vlfeat,mylxiaoyi/vlfeat,qubick/vlfeat,erexhepa/vlfeat,hongzhili/vlfeat,cvfish/vlfeat,mylxiaoyi/vlfeat,qubick/vlfeat,richarddzh/vlfeat,vlfeat/vlfeat,erexhepa/vlfeat,j-bo/vlfeat,richarddzh/vlfeat,vlfeat/vlfeat,vlfeat/vlfeat,CansenJIANG/vlfeat,cvfish/vlfeat,erexhepa/vlfeat,hongzhili/vlfeat,j-bo/vlfeat,WangDequan/vlfeat,hongzhili/vlfeat