_wedxGroupAddress needs to be passed in constructor

The _wedxGroupAddress dependency is currently not passed as a constructor parameter, which limits deployment flexibility and ties the group reference to a value set at compile time rather than at deployment time.

Without constructor parameterisation, redeploying or reusing the contract on a new environment requires recompiling rather than redeploying with a new configuration. While not a direct security issue, this hampers operational flexibility.

Pass _wedxGroupAddress as a parameter in the constructor to allow greater flexibility and configurability during deployment.