Fix walk speed and fly speed, Add Player.DEFAULT_FLY_SPEED

Author: GoodLucky777

src/main/java/cn/nukkit/AdventureSettings.java

@@ -80,8 +80,8 @@ public void update() {
             layer.getAbilityValues().add(PlayerAbility.OPERATOR_COMMANDS);
         }
 
-        layer.setWalkSpeed(0.05f);
-        layer.setFlySpeed(0.1f);
+        layer.setWalkSpeed(Player.DEFAULT_SPEED);
+        layer.setFlySpeed(Player.DEFAULT_FLY_SPEED);
         packet.getAbilityLayers().add(layer);
 
         UpdateAdventureSettingsPacket adventurePacket = new UpdateAdventureSettingsPacket();

src/main/java/cn/nukkit/Player.java

@@ -143,6 +143,8 @@ public class Player extends EntityHuman implements CommandSender, InventoryHolde
     public static final float DEFAULT_SPEED = 0.1f;
     public static final float MAXIMUM_SPEED = 0.5f;
 
+    @PowerNukkitOnly @Since("FUTURE") public static final float DEFAULT_FLY_SPEED = 0.05f;
+
     public static final int PERMISSION_CUSTOM = 3;
     public static final int PERMISSION_OPERATOR = 2;
     public static final int PERMISSION_MEMBER = 1;