Adjusted tests for the new responseType parameter (part 3)

ref #132

src/tests/donations/donations_update.spec.ts

@@ -323,7 +323,6 @@ describe('adding + updating distance donation valid', () => {
 			"amountPerDistance": 69,
 			"donor": added_donor.id
 		}, axios_config);
-		delete res.data.runner;
 		expect(res.status).toEqual(200);
 		expect(res.headers['content-type']).toContain("application/json");
 		expect(res.data.runner).toEqual(added_runner2);