Remove useless hidpi_factor variable from main.rs

src/main.rs

@@ -19,7 +19,6 @@ fn main() {
     let mut input = WinitInputHelper::new();
     let event_loop = EventLoop::new();
     let window = init_window(&event_loop);
-    let mut hidpi_factor = window.scale_factor();
     let mut pixels = init_pixels(&window);
 
     let rom_path = Path::new("./games/ibm_logo.ch8");
@@ -44,10 +43,6 @@ fn main() {
                 return;
             }
 
-            if let Some(factor) = input.scale_factor_changed() {
-                hidpi_factor = factor;
-            };
-
             if let Some(size) = input.window_resized() {
                 pixels.resize(size.width, size.height);
             }