revert change that's no longer needed

Author: mjasper

Mathlib/NumberTheory/ModularForms/JacobiTheta/TwoVariable.lean

@@ -191,7 +191,6 @@ lemma norm_jacobiTheta₂_term_fderiv_ge (n : ℤ) (z τ : ℂ) :
   simp_rw [norm_real, norm_of_nonneg pi_pos.le, norm_I, mul_one,
     Int.cast_abs, ← norm_intCast, norm_pow]
 
-set_option backward.isDefEq.respectTransparency false in
 lemma summable_jacobiTheta₂_term_fderiv_iff (z τ : ℂ) :
     Summable (jacobiTheta₂_term_fderiv · z τ) ↔ 0 < im τ := by
   constructor