www/gitlab: fix regression from dbc3f874de613640cbc2151dcc4fa39ce6433461

bundler: failed to load command: puma (/usr/local/bin/puma)
/usr/local/www/gitlab/config/initializers/redis_client_patch.rb:8:in `<top (required)>': New version of redis-client detected, please remove this file (RuntimeError)