PixelPaint: Store tool cursors as NNRP<Gfx::Bitmap const>

Author: https://github.com/awesomekling
Commit: df07416171
Pull-request: https://github.com/SerenityOS/serenity/pull/17557
Reviewed-by: https://github.com/linusg

Userland/Applications/PixelPaint/Tools/TextTool.h

@@ -40,7 +40,7 @@ public:
     virtual void on_second_paint(Layer const*, GUI::PaintEvent&) override;
     virtual void on_primary_color_change(Color) override;
     virtual void on_tool_deactivation() override;
-    virtual Variant<Gfx::StandardCursor, NonnullRefPtr<Gfx::Bitmap>> cursor() override;
+    virtual Variant<Gfx::StandardCursor, NonnullRefPtr<Gfx::Bitmap const>> cursor() override;
     virtual ErrorOr<GUI::Widget*> get_properties_widget() override;
 
 private: