owpreprocess: Ensure correct overlay visibility state
owpreprocess: Ensure correct overlay visibility state

The overlay would remain visible when a new model was set with
`set_model`.

cheral/orange3,qPCR4vir/orange3,kwikadi/orange3,kwikadi/orange3,marinkaz/orange3,cheral/orange3,cheral/orange3,cheral/orange3,qPCR4vir/orange3,qPCR4vir/orange3,kwikadi/orange3,marinkaz/orange3,marinkaz/orange3,qPCR4vir/orange3,marinkaz/orange3,kwikadi/orange3,marinkaz/orange3,kwikadi/orange3,kwikadi/orange3,qPCR4vir/orange3,cheral/orange3,marinkaz/orange3,cheral/orange3,qPCR4vir/orange3