@polynomial_ring support for key-value pairs is broken

[fingolfin]

This works:

julia> polynomial_ring(QQ, ["x", "y"]; internal_ordering=:lex)
(Multivariate polynomial ring in 2 variables over rationals, AbstractAlgebra.Generic.MPoly{Rational{BigInt}}[x, y])

But the macro version does not:

julia> @polynomial_ring(QQ, ["x", "y"]; internal_ordering=:lex)
ERROR: LoadError: MethodError: no method matching popfirst!(::Tuple{Expr, Symbol, Expr})

Closest candidates are:
  popfirst!(::BitVector)
   @ Base bitarray.jl:868
  popfirst!(::BitSet)
   @ Base bitset.jl:276
  popfirst!(::AbstractChannel)
   @ Base channels.jl:11
  ...

Stacktrace:
 [1] var"@polynomial_ring"(__source__::LineNumberNode, __module__::Module, args::Vararg{Any})
   @ AbstractAlgebra ~/Projekte/OSCAR/AbstractAlgebra.jl/src/misc/VarNames.jl:293
in expression starting at REPL[40]:1

So it tries to popfirst! a macro, which of course doesn't work.