Terminate loop explicitly on interrupted

Make explicit that the loop terminates when the current thread is
interrupted.

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

@@ -75,7 +75,7 @@ public class Controller {
             SystemClock.sleep(500);
         }
 
-        while (true) {
+        while (!Thread.currentThread().isInterrupted()) {
             handleEvent();
         }
     }

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

@@ -25,7 +25,7 @@ public final class DeviceMessageSender {
     }
 
     public void loop() throws IOException, InterruptedException {
-        while (true) {
+        while (!Thread.currentThread().isInterrupted()) {
             String text;
             long sequence;
             synchronized (this) {