citrus_jms_expiration does not map to JMSExpiration

**Citrus Version**
2.8.0

**Expected behavior**
value set for citrus_jms_expiration should be mapped to JMSExpiration

**Actual behavior**
value is not mapped

**Test case sample**
> Please, share the test case (as small as possible) which shows the issue
@Test
public class ExpirationIT extends TestNGCitrusTestDesigner {

@CitrusTest(name = "ExpirationTest")
public void sendMessage() {
send("endpoint")
.header("citrus_jms_expiration", 1000) // .header("citrus_jms_expiration", "1000")
.payload("payload");
}
}