[Lazarus] Cosmetically fix HeaderSrc const

[AlexeyT]

IMO such const will be nicer to read in package files. so I fixed it. 
before it was like

{ ddddddddddddddd

    ddddddddddddddd

}

Now it's like

// dddddddddddddd

// dddddddddddddd


-- 
Regards,
Alexey

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