Update script config parameters

[Sukh-P]

Pull Request

Description

Updating the config parameters to the dataloader in the save_concurrent_batches script to match the structure in the config example files and the save_batches script.

Also updated an incorrect install command for ocf_datapipes in the README

How Has This Been Tested?

Ran some batch creation with the changes.

Checklist:

• [X] My code follows OCF's coding style guidelines
• [X] I have performed a self-review of my own code
• [X] 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