Simplify ScreenEncoder

Do not handle iFrameInterval field and parameter, it is never used
dynamically.

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

@@ -27,19 +27,13 @@ public class ScreenEncoder implements Device.RotationListener {
 
     private int bitRate;
     private int maxFps;
-    private int iFrameInterval;
     private boolean sendFrameMeta;
     private long ptsOrigin;
 
-    public ScreenEncoder(boolean sendFrameMeta, int bitRate, int maxFps, int iFrameInterval) {
+    public ScreenEncoder(boolean sendFrameMeta, int bitRate, int maxFps) {
         this.sendFrameMeta = sendFrameMeta;
         this.bitRate = bitRate;
         this.maxFps = maxFps;
-        this.iFrameInterval = iFrameInterval;
-    }
-
-    public ScreenEncoder(boolean sendFrameMeta, int bitRate, int maxFps) {
-        this(sendFrameMeta, bitRate, maxFps, DEFAULT_I_FRAME_INTERVAL);
     }
 
     @Override
@@ -55,7 +49,7 @@ public class ScreenEncoder implements Device.RotationListener {
         Workarounds.prepareMainLooper();
         Workarounds.fillAppInfo();
 
-        MediaFormat format = createFormat(bitRate, maxFps, iFrameInterval);
+        MediaFormat format = createFormat(bitRate, maxFps, DEFAULT_I_FRAME_INTERVAL);
         device.setRotationListener(this);
         boolean alive;
         try {