TB9: Wikipedia address bar search broken

Using the TB9 address bar to search for anything on Wikipedia, the browser just makes a GET request to https://en.wikipedia.org/wiki/Special:Search without any parameters.

Tested with https://people.torproject.org/~gk/builds/9.0-build2/tor-browser-linux64-9.0_en-US.tar.xz

Trac:
Username: rustybird