ULPError: delete unnecessary method static parameters

Specialization on the callable argument types should happen anyway.

Author: nsajko

test/testhelpers/ULPError.jl

@@ -33,7 +33,7 @@ module ULPError
         end
         abs(Float32((approximate - acc) / eps(approximate))::Float32)
     end
-    function ulp_error(accurate::Acc, approximate::App, x::AbstractFloat) where {Acc, App}
+    function ulp_error(accurate, approximate, x::AbstractFloat)
         acc = accurate(x)
         app = approximate(x)
         ulp_error(acc, app)