fix import path in custom bundle script

Author: archmoj

devtools/regl_codegen/server.mjs

@@ -1,5 +1,5 @@
 import fs from 'fs';
-import path  from 'path';
+import path from 'path';
 import http from 'http';
 import ecstatic from 'ecstatic';
 import open from 'open';

tasks/custom_bundle.mjs

@@ -1,4 +1,4 @@
-var path = require('path');
+import path from 'path';
 import minimist from 'minimist';
 import runSeries from 'run-series';