Fix divide by zero clicking the profiles scrollbar

The scrollbar hit test was pure geometry, so clicking its column before the
profile list had loaded - or on any list short enough not to scroll - divided
by a maxScrollY of zero. The draw path already guarded on the same value.

src/main/java/noppes/npcs/client/gui/player/inventory/GuiProfiles.java

@@ -429,6 +429,9 @@ public class GuiProfiles extends GuiCNPCInventory implements ISubGuiListener, IC
     }
 
     private boolean isMouseOverScrollbar(int mouseX, int mouseY) {
+        if (maxScrollY <= 0)
+            return false;
+
         int scrollbarX = guiLeft + xSize + 30;
         int scrollbarY = guiTop + 27;
         int scrollbarHeight = ySize - 35;