Fixes 1110358 - Enable Location APIs

This just adds the NSLocationWhenInUseUsageDescription key to the Info.plist. This allows the application to use location services, including from `WKWebView`.
This message will be shown the first time the application itself requests location access. Ideally we'd want the user to allow the application to access their location, and then have  some other UI (handled by the app) that deals with a specific site asking for location permissions. If we phrased the initial message as 'this site would like your location', and the user did not grant permission, that would bar all other sites from using their location and could create confusion.