simplify chebyshev/ultraspherical conversions (#221)

* simplify chebyshev/ultraspherical conversions

* undo vector push

Author: jishnub

src/Spaces/Ultraspherical/UltrasphericalOperators.jl

@@ -149,7 +149,7 @@ function Conversion(A::Chebyshev, B::Ultraspherical)
         U = domainspace(last(v))
         CAU = ConcreteConversion(A, U)
         v2 = Union{eltype(v), typeof(CAU)}[v; CAU]
-        bwsum = (0, (isapproxinteger(mB) ? 2length(v2) : ℵ₀))
+        bwsum = isapproxinteger(mB) ? (0, 2length(v2)) : (0,ℵ₀)
         return ConversionWrapper(TimesOperator(v2, bwsum, (ℵ₀,ℵ₀), bwsum), A, B)
     end
     throw(ArgumentError("please implement $A → $B"))
@@ -183,7 +183,7 @@ function Conversion(A::Ultraspherical,B::Ultraspherical)
                 vlast = ConcreteConversion(A, Ultraspherical(last(r)-1, d))
                 v = [v; vlast]
             end
-            bwsum = (0, (isapproxinteger(b-a) ? 2length(v) : ℵ₀))
+            bwsum = isapproxinteger(b-a) ? (0, 2length(v)) : (0,ℵ₀)
             return ConversionWrapper(TimesOperator(v, bwsum, (ℵ₀,ℵ₀), bwsum), A, B)
         end
     end