Fix compiler warnings

src/main.rs

@@ -4,7 +4,6 @@ mod screenshot;
 mod settings;
 mod state;
 
-use std::io::Cursor;
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::Arc;
 

src/screenshot.rs

@@ -403,7 +403,7 @@ mod ffi {
             let mut pixels: Vec<Pixel> = Vec::with_capacity((width * height) as usize);
 
             for row_i in (0..height as usize).rev() {
-                for byte_i in (0..width as usize) {
+                for byte_i in 0..width as usize {
                     let idx = row_i * row_len + byte_i * pixel_width;
                     pixels.push(Pixel {
                         b: data[idx],