update default head part size

src/main/java/cc/fascinated/controller/PlayerController.java

@@ -42,7 +42,7 @@ public class PlayerController {
     @GetMapping(value = "/{part}/{id}")
     public ResponseEntity<?> getPlayerHead(@PathVariable String part,
                                                 @PathVariable String id,
-                                                @RequestParam(required = false, defaultValue = "250") int size) {
+                                                @RequestParam(required = false, defaultValue = "256") int size) {
         Player player = playerManagerService.getPlayer(id);
         byte[] partBytes = new byte[0];
         if (player != null) { // The player exists

src/main/java/cc/fascinated/model/player/Skin.java

@@ -87,7 +87,7 @@ public class Skin {
     @Getter @AllArgsConstructor
     public enum Parts {
 
-        HEAD(8, 8, 8, 8, 128);
+        HEAD(8, 8, 8, 8, 256);
 
         /**
          * The x and y position of the part.