fix(overlay): Remove zqfield function from the overlay

As it is not a package and since users should be using the `zqfield-bn254`
package instead.

Author: PetarKirov

overlay.nix

@@ -135,7 +135,6 @@ in {
 
     inherit pistache;
     inherit zqfield-bn254;
-    inherit zqfield;
     inherit ffiasm;
     inherit circom_runtime;
     inherit rapidsnark;