Update test to be more strict

- test now verifies more of the string instead of just a
  number

ee/spec/frontend/vulnerabilities/vulnerability_list_spec.js

@@ -130,7 +130,7 @@ describe('Vulnerability list component', () => {
       const cellText = findCellText(`location-${id}`);
       expect(cellText).toContain(project.nameWithNamespace);
       expect(cellText).toContain(location.file);
-      expect(cellText).toContain(location.startLine);
+      expect(cellText).toContain(`(line: ${location.startLine})`);
     });
 
     it('should display the vulnerability locations for code with no line data', () => {