Fix gclient config for the `website` project.

The website checkout doesn't have a `src` solution, so
use `website` instead.

Bug: 392668431
Change-Id: I4f488f01c4c63240a5df3f8553e6c637d1bbe9f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/6204242
Reviewed-by: Robbie Iannucci <iannucci@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@google.com>

recipes/recipe_modules/gclient/config.py

@@ -523,7 +523,7 @@ def website(c):  # pragma: no cover
   s.name = 'website'
   s.url = ChromiumGitURL(c, 'website.git')
   m = c.got_revision_mapping
-  m['src'] = 'got_revision'
+  m['website'] = 'got_revision'
 
 
 @config_ctx()