revert moving Fun(identity, ::Interval) (#320)

Author: jishnub

src/constructors.jl

@@ -183,9 +183,6 @@ function Fun(::typeof(identity), d::Domain)
     end
 end
 
-Fun(::typeof(identity), d::IntervalOrSegment{<:Number}) =
-    Fun(Space(d), [mean(d), complexlength(d)/2])
-
 Fun(::typeof(identity), S::Space) = Fun(identity,domain(S))