Fix misplaced buttons in game interface for very small windows

The game interface draws the frame manually using the render size.
The size given in the resize event data is capped, so the buttons might
end up outside the screen.
For consistency use the same size here so the full frame is always intact.

Author: Flamefire

libs/s25main/desktops/dskGameInterface.cpp

@@ -301,8 +301,10 @@ void dskGameInterface::Resize(const Extent& newSize)
     cbb.buildBorder(newSize, borders);
 
     // move buttons
-    DrawPoint barPos((newSize.x - LOADER.GetImageN("resource", 29)->getWidth()) / 2 + 44,
-                     newSize.y - LOADER.GetImageN("resource", 29)->getHeight() + 4);
+    // Get real renderer size as newSize may get capped but we want to keep the manually drawn borders intact
+    const Extent realNewSize = VIDEODRIVER.GetRenderSize();
+    DrawPoint barPos = DrawPoint((realNewSize.x - LOADER.GetImageN("resource", 29)->getWidth()) / 2 + 44,
+                                 realNewSize.y - LOADER.GetImageN("resource", 29)->getHeight() + 4);
 
     auto* button = GetCtrl<ctrlButton>(ID_btMap);
     button->SetPos(barPos);