refactor(syntax) ♻️ : use field initialization shorthand

In `struct`/`enum` initializations, if the field and variable have the same
name, the field name is redundant and shorthand syntax is applicable.

Co-authored-by: deepsource-autofix[bot] <62050782+deepsource-autofix[bot]@users.noreply.github.com>

src/main.rs

@@ -33,7 +33,7 @@ async fn main() {
 
     let server = Server {
         clients: Arc::new(Mutex::new(HashMap::new())),
-        docker: docker,
+        docker,
         id: 0,
     };
 

src/server.rs

@@ -161,7 +161,7 @@ impl Server {
             .expect("Client not found");
         let output = Arc::new(Mutex::new(output));
         client.io = Some(OutputInputPair {
-            input: input,
+            input,
             output: Arc::clone(&output),
         });
         let session_handle = Arc::new(Mutex::new(session_handle.clone()));