Fix: favicon wasn't showing up.
Fix: favicon wasn't showing up.

Closes #1719.

moritz9/redash,hudl/redash,getredash/redash,rockwotj/redash,crowdworks/redash,hudl/redash,getredash/redash,vishesh92/redash,rockwotj/redash,EverlyWell/redash,44px/redash,alexanderlz/redash,M32Media/redash,44px/redash,chriszs/redash,getredash/redash,denisov-vlad/redash,useabode/redash,moritz9/redash,crowdworks/redash,denisov-vlad/redash,getredash/redash,alexanderlz/redash,M32Media/redash,alexanderlz/redash,44px/redash,chriszs/redash,denisov-vlad/redash,hudl/redash,rockwotj/redash,chriszs/redash,moritz9/redash,44px/redash,useabode/redash,useabode/redash,vishesh92/redash,chriszs/redash,denisov-vlad/redash,rockwotj/redash,vishesh92/redash,hudl/redash,EverlyWell/redash,alexanderlz/redash,getredash/redash,vishesh92/redash,useabode/redash,crowdworks/redash,denisov-vlad/redash,EverlyWell/redash,M32Media/redash,EverlyWell/redash,crowdworks/redash,M32Media/redash,moritz9/redash