Clicking search button doesn't rerun a search if the search hasn't changed

Created by: benvenker

• Sourcegraph version: Sourcegraph.com
• Platform information: All

Steps to reproduce:

1. Enter a search in https://sourcegraph.com/search and run it
2. Click the search button
3. See that it doesn't rerun the search

Expected behavior:

The search should rerun

Actual behavior:

The search doesn't rerun