Search routes/ recursively for routing files
Search routes/ recursively for routing files

Allows better repo organization by searching subdirectories of routes/
for .js files.

This change would likely be a useful one to upstream into the template.

Change-Id: If8fff6fafe9455a474755237be78317cf8c90505

wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps