Remove some unused template context from code views

These variables were previously used in shared code for the request
and workspace views. Now that we're refactored those to move logic
into the views, we don't need them here either.

airlock/views/code.py

@@ -73,9 +73,6 @@ def view(request, workspace_name: str, commit: str, path: str = ""):
             "repo": repo,
             "root": tree,
             "path_item": path_item,
-            "is_supporting_file": False,
-            "is_author": False,
-            "is_output_checker": False,
             "title": f"{repo.repo}@{commit[:7]}",
             "current_request": current_request,
             "return_url": return_url,