[Lazarus] Cosmetically fix HeaderSrc const

[AlexeyT via Lazarus]

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

[Michael Van Canneyt via Lazarus]

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

Actually, I prefer the { } way.

Michael.