[jaxrs-cxf-cdi] Fix issue when generating code for header params when there are defaultValues defined

[vithu30]

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Fixes #7871.

[wing328]

cc @bbdouglas (2017/07) @sreeshas (2017/08) @jfiala (2017/08) @lukoyanov (2017/09) @cbornet (2017/09) @jeff9finger (2018/01) @karismann (2019/03) @Zomzog (2019/04) @lwlee2608 (2019/10) @bkabrda (2020/01)

[wing328]

Pushed 609b7cb to remove the new line in the EOF. Let's see how that goes.