Remove enum elaborated type specifier

...from orientation params. Elaborated type specifiers are not needed
for C++ code and removing them makes doxygen happy. Verified working
on both gcc2h and gcc4h builds.

src/kits/interface/ScrollBar.cpp

@@ -595,7 +595,7 @@ BScrollBar::Target() const
 
 
 void
-BScrollBar::SetOrientation(enum orientation orientation)
+BScrollBar::SetOrientation(orientation orientation)
 {
 	if (fOrientation == orientation)
 		return;