Fix get all courses api

Description

Get all courses API now returns all courses from the most recent school year that has course data in the database, rather than courses of the current school year. This prevents no courses from being returned when the school year has changed but courses for that year have not yet been uploaded.

Resolves #57 (closed)

Type

Please delete options that are not relevant.

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

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• 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

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