remove default config paths for CODA

On 12.11.2024 tbl-mb was renamed tbl to match other instruments. This broke CODA during the cycle when it looked for a file that no longer existed. These file paths were hardcoded in devices, which is normal for instruments but not optimal for CODA, where we may wish to switch between different paths without updating the device itself.

By ensuring the path is initially set blank, we ensure it has to be set somewhere. This now is done in the CODA script, which is available at https://confluence.ess.eu/display/ECDC/CODA . By adding it to the script, we also allow for a demo of the capabilities of NICOS scripting - in this case, we show how we can set parameters for devices, and the limitations of doing so for expert devices.

As an action of this PR, the script on that page should be added to a new repo and deployed onto coda-nicosserver01 via dm-ansible