Fix rig.json name

[alexpiet]

Pull Request instructions:

• Please follow the update protocol
• Answer the questions below in detail. Your responses will be emailed to experimenters.
• If the experimenters must do anything new, provide detailed step by step instructions on the wiki
• If computer maintainers need to manually update anything, provide detailed step by step instructions
• Use markdown syntax in order for your comments to be rendered reliably in the email: "1." instead of "1)", use four spaces for indents.
• If you use the keyword "skip email" in the title, it will skip the email updates
• Merges from "develop" into "production_testing" should use the keyword "production merge" in the title for reliable indexing of updates
• Merges from "production_testing" into "main" should use the keyword "update main"

Describe changes:

When uploading the rig metadata, the file must be named rig.json and not using the full name that specifies the behavior box and time.

What issues or discussions does this update address?

• resolves #564

Describe the expected change in behavior from the perspective of the experimenter

• none

Describe any manual update steps for task computers

• none

Was this update tested in 446/447?

• [x] tested on my laptop