remove course parameter from LtiSyncJob

[pretendWhale]

Proposed Changes

(Describe your changes here. Also describe the motivation for your changes: what problem do they solve, or how do they improve the application or codebase? If this pull request fixes an open issue, use a keyword to link this pull request to the issue.)

The LtiSyncJob class, which is used for syncing grades from MarkUs to Canvas, also makes a call to roster_sync. In a previous PR, the course parameter was removed from roster_sync, but the method call in LtiSyncJob was not correctly updated. This PR fixes this issue and removes the course parameter from LtiSyncJob.
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Type	Applies?
🚨 Breaking change (fix or feature that would cause existing functionality to change)
✨ New feature (non-breaking change that adds functionality)
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♻️ Refactoring (internal change to codebase, without changing functionality)
🚦 Test update (change that only adds or modifies tests)
📦 Dependency update (change that updates a dependency)
🔧 Internal (change that only affects developers or continuous integration)

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[coveralls]

Pull Request Test Coverage Report for Build 11203013745

Details

• 5 of 6 (83.33%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 91.651%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
app/jobs/lti_sync_job.rb	1	2	50.0%

Totals
Change from base Build 11202980783:	0.0%
Covered Lines:	40656
Relevant Lines:	43687

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💛 - Coveralls