Testsuite: Assert.equal should compare actual with expected

Assert compares actual/actual. It should be expected/actual

• https://github.com/resteasy/Resteasy/blob/5.0.0.Alpha1/testsuite/integration-tests/src/test/java/org/jboss/resteasy/test/rx/rxjava2/Rx2ObservableTest.java#L571
• https://github.com/resteasy/Resteasy/blob/5.0.0.Alpha1/testsuite/integration-tests/src/test/java/org/jboss/resteasy/test/rx/rxjava2/Rx2FlowableTest.java#L570

Fix: Fix parameter of Assert.equal