too much data in csv export #3054

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Describe the bug

1. start a new form
2. invite two users to only answer, not to show results
3. as the creator I see all three results
4. the users see only their own answers (as expected)
5. as creator I can export the result with all three rows as csv (as expected)
6. as user, i can also export the result with all three rows (not expected)

Expected behavior
export should not possible to users with no permission

• Nextcloud-Version: 31.0.10

• Forms-Version: 5.2.2

• OS: [Windows 10]

• Browser [Firefox]

• Version [140]