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8fcb85e8 - Trac #34811: rational maps for WeierstrassIsomorphism should not be polynomials

Trac #34811: rational maps for WeierstrassIsomorphism should not be polynomials The methods `.rational_maps()` and `.x_rational_map()` for `WeierstrassIsomorphism` return polynomials, but the same methods for other `EllipticCurveHom` return rational maps (i.e., elements of the fraction field). For consistency, these methods should return the same types in all child classes of `EllipticCurveHom`, despite the rational maps actually having denominator `1` in this case. URL: https://trac.sagemath.org/34811 Reported by: lorenz Ticket author(s): Lorenz Panny Reviewer(s): Travis Scrimshaw