[decoration] Use client's depth in X11Renderer for put_image

If the Client uses ARGB the depth is not 24, thus we should use
the actual depth from the Client.

BUG: 342757

decorations/decorationrenderer.cpp

@@ -140,7 +140,8 @@ void X11Renderer::render()
         }
         QImage image = renderToImage(geo);
         xcb_put_image(c, XCB_IMAGE_FORMAT_Z_PIXMAP, client()->client()->frameId(), m_gc,
-                    image.width(), image.height(), geo.x(), geo.y(), 0, 24, image.byteCount(), image.constBits());
+                      image.width(), image.height(), geo.x(), geo.y(), 0, client()->client()->depth(),
+                      image.byteCount(), image.constBits());
     };
     renderPart(left);
     renderPart(top);