fix similarterm

Author: shashi

src/TermInterface.jl

@@ -118,15 +118,12 @@ when manipulating `Expr`s.
 """
 function similarterm(x, head, args, symtype = nothing; metadata = nothing, exprhead = nothing)
   if exprhead === nothing
-    similarterm(typeof(x), head, args, symtype; metadata = metadata)
+    similarterm(x, head, args, symtype; metadata = metadata)
   else
-    similarterm(typeof(x), head, args, symtype; metadata = metadata, exprhead = exprhead)
+    similarterm(x, head, args, symtype; metadata = metadata, exprhead = exprhead)
   end
 end
 
-function similarterm(x::Type{T}, head, args, symtype = nothing; metadata = nothing, exprhead = :call) where {T}
-  !istree(T) ? head : head(args...)
-end
 export similarterm
 
 include("utils.jl")