fix: Fix textureHandle accessor

This was introduced when vgl was merged.

src/vgl/texture.js

@@ -230,6 +230,15 @@ vgl.texture = function () {
  }
  };
 
+ /**
+ * Return the texture handle.
+ *
+ * @returns {number}
+ */
+ this.textureHandle = function () {
+ return this.m_textureHandle;
+ };
+
  return this;
 };
 
@@ -349,15 +358,6 @@ vgl.lookupTable = function () {
  return true;
  };
 
- /**
- * Return the texture handle.
- *
- * @returns {number}
- */
- this.textureHandle = function () {
- return this.m_textureHandle;
- };
-
  return this;
 };