PixelPaint: Tweak layer/tool properties widget heights

There's no use for these two to be larger than necessary when
resizing the window.

Userland/Applications/PixelPaint/PixelPaintWindow.gml

@@ -61,10 +61,12 @@
 
             @PixelPaint::LayerPropertiesWidget {
                 name: "layer_properties_widget"
+                max_height: 94
             }
 
             @PixelPaint::ToolPropertiesWidget {
                 name: "tool_properties_widget"
+                max_height: 144
             }
         }
     }