Fix between condition in send_media_group method

[OnlyFart]

Description

Fix between condition in send_media_group method

Type of change

Please delete options that are not relevant.

• Documentation (typos, code examples or any documentation update)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[evgfilim1]

Hello, @OnlyFart, and thanks for contributing!
Please, fill in the provided pull request template next time you wanna contribute somewhere. For now I've done it for you.