Feature: Update accepts_submission to false in database_lessons.rb (#…

…4677)

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## Because
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Submissions in SQL Zoo project does not make sense as solutions are self
validated.

## This PR
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- Change accepts_submission to false

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Closes #4630

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db/fixtures/lessons/database_lessons.rb

@@ -19,7 +19,7 @@ def database_lessons
       description: 'The best way to learn is by practice, so this project will give you plenty of opportunity to apply your new SQL powers (for good).',
       is_project: true,
       github_path: '/databases/databases/project_sql_zoo.md',
-      accepts_submission: true,
+      accepts_submission: false,
       previewable: false,
       identifier_uuid: 'a4baeee4-7bab-47ba-8157-c8f52b204734',
     },