Fix incorrect `\` in several snippets

The `timeout`, `interval` and `try` snippets had `\}` in them, which should just be a normal `}`.

Similar to https://github.com/atom/language-javascript/commit/cbaef8bf4faa92d9ccc4a10efd0192803e593670
Merge pull request #6 from guidokessels/patch-1

Fix incorrect `\` in several snippets