Fix typo in default window height

src/framework/backend.rs

@@ -118,7 +118,7 @@ pub struct WindowParams {
 impl Default for WindowParams {
     fn default() -> Self {
         Self {
-            size_hint: (640, 48),
+            size_hint: (640, 480),
             mode: WindowMode::Windowed,
         }
     }
@@ -155,4 +155,4 @@ pub enum SpriteBatchCommand {
     DrawRectFlip(Rect<f32>, Rect<f32>, bool, bool),
     DrawRectTinted(Rect<f32>, Rect<f32>, Color),
     DrawRectFlipTinted(Rect<f32>, Rect<f32>, bool, bool, Color),
-}
+}