Reset group-page as well when calling CGUIProfiler::firstPage.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4820 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/CGUIProfiler.cpp

@@ -217,6 +217,7 @@ void CGUIProfiler::firstPage(bool includeOverview)
 		CurrentGroupIdx = 0;
     else
 		CurrentGroupIdx = 1; // can be invalid
+	CurrentGroupPage = 0;
 }