Unnecessary double call to `counts` for `association(::JointProbabilities{<:MIShannon}, x, y)`

In the file `methods/information/definitions/mutual_informations/MIShannon.jl`: The `cts = counts(est.discretization, x, y)` line is completely unnecessary. The counts are automatically computed when calling `probabilities` on the line below. This extra line essentially doubles computation time.