remove build type

Author: ShkarupaNick

component.json

@@ -2,7 +2,6 @@
     "title": "Node.js Code",
     "version": "1.2.6",
     "description": "You can write your own code and deploy it as part of integration process.",
-    "buildType": "docker",
     "docsUrl": "http://go2.elastic.io/code-component",
     "fields": {
         "code": {