Removed test for content type

ref #190

src/tests/stats/stats_get.spec.ts

@@ -28,7 +28,6 @@ describe('GET /api/stats/runners/distance w/o auth should return 200', () => {
             validateStatus: undefined
         });
         expect(res.status).toEqual(401);
-        expect(res.headers['content-type']).toContain("application/json");
     });
 });
 // ---------------