fix(client-ngx): Omit warnings for Angular import: Use cjs module as main

Author: paveltiunov

packages/cubejs-client-ngx/package.json

@@ -2,7 +2,7 @@
   "name": "@cubejs-client/ngx",
   "version": "0.10.15",
   "description": "Cube.js client for Angular",
-  "main": "dist/cubejs-client-ngx.umd.js",
+  "main": "dist/cubejs-client-ngx.js",
   "license": "MIT",
   "dependencies": {
     "@angular/core": "^6.1.0 || ^7.0.0",