remove unused variable

Author: lkdvos

src/fusiontrees/manipulations.jl

@@ -356,7 +356,6 @@ function foldright((f₁, f₂)::FusionTreePair{I,N₁,N₂}) where {I,N₁,N₂
         fr = FusionTree{I}((c1, f₂.uncoupled...), c, (!isduala, f₂.isdual...))
         return fusiontreedict(I)((fl, fr) => factor)
     else
-        hasmultiplicities = FusionStyle(a) isa GenericFusion
         local newtrees
         if N₁ == 1
             cset = (leftone(c1),) # or rightone(a)