Remove useless destroyDisplay() method

The method made exactly one simple call. Just make the call directly.

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

@@ -128,7 +128,7 @@ public class ScreenEncoder implements Device.RotationListener {
             } while (alive);
         } finally {
             device.setRotationListener(null);
-            destroyDisplay(display);
+            SurfaceControl.destroyDisplay(display);
         }
     }
 
@@ -297,8 +297,4 @@ public class ScreenEncoder implements Device.RotationListener {
             SurfaceControl.closeTransaction();
         }
     }
-
-    private static void destroyDisplay(IBinder display) {
-        SurfaceControl.destroyDisplay(display);
-    }
 }