tools: reference dist/ folder in team-generation-benchmark script (c…

…loses smogon#10644)

This PR addresses [smogon#10644](smogon#10644).

Developers just need to run `node build` to rebuild the `dist` folder whenever the `.ts` files in `sim/` change.

## Other Considerations
- Add a watch script to rebuild when ``.ts`` changes.
- Convert the script itself to TypeScript & compile it with ``tsc``.
- Convert the script itself to TypeScript & use ``ts-node``  + ``nodemon``.

tools/team-generation-benchmark.js

@@ -1,7 +1,7 @@
 'use strict';
 
-const {Teams} = require('../sim');
-const {Dex} = require('../sim/dex');
+const {Teams} = require('../dist/sim');
+const {Dex} = require('../dist/sim/dex');
 
 
 if (!process.argv[2]) {