Do not double copy Proto files

Author: schmidt-sebastian

packages/firestore/rollup.config.node.memory.js

@@ -17,7 +17,6 @@
 
 import * as path from 'path';
 import replace from 'rollup-plugin-replace';
-import copy from 'rollup-plugin-copy-assets';
 import memoryPkg from './memory/package.json';
 
 const util = require('./rollup.shared');
@@ -32,10 +31,6 @@ export default [
     },
     plugins: [
       ...util.es2017Plugins('node'),
-      // Needed as we also use the *.proto files
-      copy({
-        assets: ['./src/protos']
-      }),
       replace({
         'process.env.FIRESTORE_PROTO_ROOT': JSON.stringify('src/protos')
       })