Fix Notification Message When Updating Permissions Of Plan Collaborators

[aaronskiba]

Fixes #3368

• #3368

Changes proposed in this PR:

• Removes hardcoded "foo:" string from success notification when permissions are changed for a plan collaborator.
• NOTE: This update will likely 'break' the corresponding translations for this segment. They will have to be re-added when the updated segment is sync'd to translation.io

[github-actions[bot]]

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