Remove updating config if there are more summary keys in storage than config

[oyvindeide]

This was probably used for extracting summary keys for plotting if there were more in storage compared with storage: https://github.com/equinor/ert/blob/d20ddc3b63cf4f5a7dc2efcfe841e7944d287392/src/ert/_c_wrappers/enkf/enkf_main.py#L180 we are moving towards an immutable configuration, so this should be removed. In the future storage should be able to present what data is available, and it should not be tied so directly to the configuration.