Access All Tables of Given Database Only for SQL Completions (fix)

[tmichaeldb]

Description

Before, any database that wasn't mindsdb would have tables eligible to be usable tables for SQL completions. However, we want to restrict to the provided database only (and default to all tables for that database).

Type of change

• 🐛 Bug fix (non-breaking change which fixes an issue)

Additional Media:

• I have attached a brief loom video or screenshots showcasing the new functionality or change.

Checklist:

• My code follows the style guidelines(PEP 8) of MindsDB.
• I have appropriately commented on my code, especially in complex areas.
• Necessary documentation updates are either made or tracked in issues.
• Relevant unit and integration tests are updated or added.