Demos: Remove useless PaintTest program

Demos/PaintTest/Makefile

@@ -1,22 +0,0 @@
-include ../../Makefile.common
-
-OBJS = \
-    main.o
-
-APP = PaintTest
-
-DEFINES += -DUSERLAND
-
-all: $(APP)
-
-$(APP): $(OBJS)
-	$(LD) -o $(APP) $(LDFLAGS) $(OBJS) -lgui -ldraw -lcore -lc
-
-.cpp.o:
-	@echo "CXX $<"; $(CXX) $(CXXFLAGS) -o $@ -c $<
-
--include $(OBJS:%.o=%.d)
-
-clean:
-	@echo "CLEAN"; rm -f $(APP) $(OBJS) *.d
-

Demos/PaintTest/main.cpp

@@ -1,53 +0,0 @@
-#include <LibGUI/GApplication.h>
-#include <LibGUI/GPainter.h>
-#include <LibGUI/GWidget.h>
-#include <LibGUI/GWindow.h>
-#include <LibDraw/PNGLoader.h>
-
-class TestWidget final : public GWidget {
-public:
-    TestWidget(GWidget* parent)
-        : GWidget(parent)
-    {
-    }
-    virtual ~TestWidget() override {}
-
-    void set_bitmap(RefPtr<GraphicsBitmap>&& bitmap)
-    {
-        m_bitmap = move(bitmap);
-        update();
-    }
-
-private:
-    virtual void paint_event(GPaintEvent&) override
-    {
-        GPainter painter(*this);
-
-        painter.fill_rect(rect(), Color::WarmGray);
-
-        painter.blit_tiled({ 0, 0, 160, 160 }, *m_bitmap, m_bitmap->rect());
-
-        painter.add_clip_rect({ 50, 50, 115, 95 });
-        painter.blit_tiled({ 160, 160, 160, 160 }, *m_bitmap, m_bitmap->rect());
-    }
-
-    RefPtr<GraphicsBitmap> m_bitmap;
-};
-
-int main(int argc, char** argv)
-{
-    GApplication app(argc, argv);
-
-    auto window = GWindow::construct();
-    window->set_rect(100, 100, 400, 400);
-    window->set_title("Paint test");
-
-    auto test_widget = new TestWidget(nullptr);
-    window->set_main_widget(test_widget);
-
-    test_widget->set_bitmap(load_png("/res/icons/gear16.png"));
-
-    window->show();
-
-    return app.exec();
-}