use real type code for arrays

src/de/inetsoftware/jwebassembly/wasm/ArrayType.java

@@ -100,15 +100,6 @@ public class ArrayType extends StructType {
         return componentClassIndex;
     }
 
-    /**
-     * {@inheritDoc}
-     */
-    @Override
-    public int getCode() {
-        // until there is a real type definition we will define write it as externref
-        return ValueType.externref.getCode();
-    }
-
     /**
      * {@inheritDoc}
      */