Merge pull request phaserjs#3541 from josephjaniga/staticbody-offset

[bugfix] StaticBody.setOffset fix for issue phaserjs#3465

Author: photonstorm

src/physics/arcade/StaticBody.js

@@ -443,8 +443,14 @@ var StaticBody = new Class({
 
         this.world.staticTree.remove(this);
 
+        this.position.x -= this.offset.x;
+        this.position.y -= this.offset.y;
+
         this.offset.set(x, y);
 
+        this.position.x += this.offset.x;
+        this.position.y += this.offset.y;
+
         this.updateCenter();
 
         this.world.staticTree.insert(this);