Stabilize JSONMarshallerTest in windows

These tests fail in Windows due to line separator 

org.junit.ComparisonFailure: expected:<{[ "order_ID" : "all"] }> but was:<{[ "order_ID" : "all" ] }> at org.junit.Assert.assertEquals(Assert.java:117) at org.junit.Assert.assertEquals(Assert.java:146) at org.kie.server.api.marshalling.JSONMarshallerTest.testLegacyFieldnames(JSONMarshallerTest.java:274)