Fixed the redundant_pattern_matching clippy warning

Relevant lint: https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern_matching

src/image_backends/kitty.rs

@@ -64,7 +64,7 @@ impl KittyBackend {
                 }
             }
         });
-        if let Ok(_) = receiver.recv_timeout(Duration::from_millis(50)) {
+        if receiver.recv_timeout(Duration::from_millis(50)).is_ok() {
             unsafe {
                 tcsetattr(STDIN_FILENO, TCSANOW, &old_attributes);
             }