[Merge] lp:~daker/webbrowser-app/fix.airbnb-smartbanner into lp:webbrowser-app

[Olivier Tilloy]

Review: Needs Fixing

The metadata of the user script should probably have a "@include" directive to limit the execution of the script to airbnb only.

Also, I’m not seeing this work (testing on desktop but forcing the formFactor to mobile, with your changes I’m still seeing the banner show up).
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https://code.launchpad.net/~daker/webbrowser-app/fix.airbnb-smartbanner/+merge/230855
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