Revert "Add rand_tangent for types (#172)"

This reverts commit bc71ac1.

Author: Miha Zgubic

src/rand_tangent.jl

@@ -57,6 +57,3 @@ function rand_tangent(rng::AbstractRNG, x::T) where {T}
         Tangent{T}(; NamedTuple{field_names}(tangents)...)
     end
 end
-
-rand_tangent(rng::AbstractRNG, ::Type) = NoTangent()
-rand_tangent(rng::AbstractRNG, ::Module) = NoTangent()

test/rand_tangent.jl

@@ -11,15 +11,6 @@ using FiniteDifferences: rand_tangent
         (:a, NoTangent),
         (true, NoTangent),
         (4, NoTangent),
-        (FiniteDifferences, NoTangent),  # Module object
-        # Types (not instances of type)
-        (Foo, NoTangent),  
-        (Union{Int, Foo}, NoTangent),
-        (Union{Int, Foo}, NoTangent),
-        (Vector, NoTangent),
-        (Vector{Float64}, NoTangent),
-        (Integer, NoTangent),
-        (Type{<:Real}, NoTangent),
 
         # Numbers.
         (5.0, Float64),