Fix Mysql UUIDField with binary_compression=True

[hendelbah]

Fix for binary_compression with mysql UUIDField

Description

Fixed a bug that breaks UUIDField from mysql, probably a misstype

Motivation and Context

Seems that this field doesnt work when binary_compression=True, to_db_value method is broken, so there is a fix

How Has This Been Tested?

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added the changelog accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[coveralls]

Pull Request Test Coverage Report for Build 10166341751

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

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Details

• 0 of 1 (0.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 89.158%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
tortoise/contrib/mysql/fields.py	0	1	0.0%

Totals
Change from base Build 10115140001:	0.0%
Covered Lines:	5939
Relevant Lines:	6550

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💛 - Coveralls