remove context generic

src/core/text.rs

@@ -20,8 +20,8 @@ impl Text {
     }
 }
 
-impl<Ctx> Widget<Ctx> for Text {
-    fn draw(&self, painter: &mut Painter<Ctx>) {
+impl Widget for Text {
+    fn draw(&self, painter: &mut Painter) {
         // TODO: when on_update is added to painter,
         // return & store TextureHandle to reuse
         painter.draw_text(&self.content, &self.attrs);