Add ecmwf to multimodal model config example

[Sukh-P]

Pull Request

Description

Updating the multimodal model config example to include ecmwf NWP to coincide with the datamodule config example for batch creation parameters

How Has This Been Tested?

Ran locally with this config

Checklist:

• [ ] My code follows OCF's coding style guidelines
• [X] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [X] I have checked my code and corrected any misspellings

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 61.47%. Comparing base (7e1dd3b) to head (1c78003).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #160 +/- ## ======================================= Coverage 61.47% 61.47% ======================================= Files 28 28 Lines 1786 1786 ======================================= Hits 1098 1098 Misses 688 688 ```

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