Visualization artifacts for multi-qubit gates that act on more than two qubits

[jofrevalles]

For multi-qubit gates that act on more than two qubits, it appears a small white space in the vertical connecting wires in its visualization.

Example:

julia> using Quac

julia> circ = Circuit(4)

julia> push!(circ, rand(SU{8}, 1, 2, 3))

julia> push!(circ, rand(SU{4}, 1, 2))

julia> push!(circ, rand(SU{16}, 1, 2, 3, 4))

julia> circ

We get: