artoolkitplus: Fix a bug introduced in c362341cf0fc54babf20f7345270179ed98c19d6 preventing all but the first detected marker from showing
artoolkitplus: Fix a bug introduced in c362341cf0fc54babf20f7345270179ed98c19d6 preventing all but the first detected marker from showing

WearableComputerLab/LibWCL,WearableComputerLab/LibWCL,WearableComputerLab/LibWCL,WearableComputerLab/LibWCL