remove unsed stub from createTestClient

Author: richvdh

test/test-utils/test-utils.ts

@@ -99,7 +99,6 @@ export function createTestClient(): MatrixClient {
         getDevice: jest.fn(),
         getDeviceId: jest.fn().mockReturnValue("ABCDEFGHI"),
         getStoredCrossSigningForUser: jest.fn(),
-        checkDeviceTrust: jest.fn(),
         getStoredDevice: jest.fn(),
         requestVerification: jest.fn(),
         deviceId: "ABCDEFGHI",