Add missing @Override annotations

PR #3978 <https://github.com/Genymobile/scrcpy/pull/3978>

server/src/main/java/com/genymobile/scrcpy/AudioEncoder.java

@@ -114,6 +114,7 @@ public final class AudioEncoder implements AsyncProcessor {
         }
     }
 
+    @Override
     public void start() {
         thread = new Thread(() -> {
             try {
@@ -129,6 +130,7 @@ public final class AudioEncoder implements AsyncProcessor {
         thread.start();
     }
 
+    @Override
     public void stop() {
         if (thread != null) {
             // Just wake up the blocking wait from the thread, so that it properly releases all its resources and terminates
@@ -136,6 +138,7 @@ public final class AudioEncoder implements AsyncProcessor {
         }
     }
 
+    @Override
     public void join() throws InterruptedException {
         if (thread != null) {
             thread.join();

server/src/main/java/com/genymobile/scrcpy/AudioRawRecorder.java

@@ -53,6 +53,7 @@ public final class AudioRawRecorder implements AsyncProcessor {
         }
     }
 
+    @Override
     public void start() {
         thread = new Thread(() -> {
             try {
@@ -68,12 +69,14 @@ public final class AudioRawRecorder implements AsyncProcessor {
         thread.start();
     }
 
+    @Override
     public void stop() {
         if (thread != null) {
             thread.interrupt();
         }
     }
 
+    @Override
     public void join() throws InterruptedException {
         if (thread != null) {
             thread.join();

server/src/main/java/com/genymobile/scrcpy/Controller.java

@@ -84,6 +84,7 @@ public class Controller implements AsyncProcessor {
         }
     }
 
+    @Override
     public void start() {
         thread = new Thread(() -> {
             try {
@@ -98,6 +99,7 @@ public class Controller implements AsyncProcessor {
         sender.start();
     }
 
+    @Override
     public void stop() {
         if (thread != null) {
             thread.interrupt();
@@ -105,6 +107,7 @@ public class Controller implements AsyncProcessor {
         sender.stop();
     }
 
+    @Override
     public void join() throws InterruptedException {
         if (thread != null) {
             thread.join();