fix_save_color

[XX-Yin]

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:

The save button color will change when the post weight changes.

What issues or discussions does this update address?

After loading a session, the save button color does not change as the post weight changes.

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

No

Describe any manual update steps for task computers

No

Was this update tested in 446/447?

Tested on my own computer