Codechange: Scrollbar methods now accept size_t.

This clears up a lot of casts from size_t to int.

src/object_gui.cpp

@@ -125,7 +125,7 @@ public:
 
 		ResetObjectToPlace();
 
-		this->vscroll->SetCount((int)this->object_classes.size());
+		this->vscroll->SetCount(this->object_classes.size());
 
 		EnsureSelectedObjectClassIsVisible();
 
@@ -166,7 +166,7 @@ public:
 		this->object_classes.RebuildDone();
 		this->object_classes.Sort();
 
-		this->vscroll->SetCount((uint)this->object_classes.size());
+		this->vscroll->SetCount(this->object_classes.size());
 	}
 
 	/**