Remove "You must answer at least ..." Message When default_percentage_answered is Set to Zero

[aaronskiba]

Fixes #3372

• #3372

Changes proposed in this PR:

• If Rails.configuration.x.plans.default_percentage_answered is non-zero, then the visibility_message prior to this commit does not change. Otherwise, the "You must answer at least 0% of the questions to enable these options." part of the visibility_message is removed.

[github-actions[bot]]

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