Remove ecos from Freyja module environment.yml

[gp201]

Freyja fails with the following error when using --autoadapt

cvxpy.error.SolverError: The solver ECOS is not installed.

Patches and Changes in the Freyja repository

To patch, we added ecos to the environment.yml in the Freyja modules in #14

A commit has been made in the Freyja repository to patch this: andersen-lab/Freyja@c9a58d6...7e47b37 which will be available in the next release after which we can remove the ecos package

Todo

Remove the ecos package from environment.yml in the Freyja modules.