Remove reset_map methods

[schillic]

The first method below does not have the right number of arguments (ConstrainedAffineMap takes three arguments):

ReachabilityAnalysis.jl/src/Hybrid/transitions.jl

Lines 33 to 34 in 42b1a8a

	reset_map(tr::DiscreteTransition{<:AbstractMatrix}) = ConstrainedAffineMap(tr.R, tr.W)
	reset_map(tr::DiscreteTransition{<:IdentityMap}) = ConstrainedIdentityMap(dim(tr.W), tr.W)

I tried to come up with a fix but found that I am generally in doubt about the semantics of reset_map. Given that the first method should throw an error, it seems to not be used. I suggest we remove them.