Add a disamgiguating conversion

Author: kshyatt

src/tensors/abstractblocktensor/conversion.jl

@@ -34,6 +34,12 @@ function Base.convert(::Type{T}, t::AbstractBlockTensorMap) where {T <: TensorMa
     return convert(T, tdst)
 end
 
+# disambiguation
+function Base.convert(::Type{TensorMap{T, S, N₁, N₂, A}}, t::AB) where {T, S, N₁, N₂, A, AB <: AbstractBlockTensorMap}
+    tdst = convert(TensorMap, t)
+    return convert(T, tdst)
+end
+
 function Base.convert(::Type{TT}, t::AbstractTensorMap) where {TT <: AbstractBlockTensorMap}
     t isa TT && return t
     if t isa AbstractBlockTensorMap