Different type at runtime vs compile-time in symphony compat code

[ColinEberhardt]

From the following line:

https://github.com/symphonyoss/ContainerJS/blob/master/packages/api-symphony-compatibility/src/mapping.ts#L19

We are invoking a function on the App object, i.e. containerjsSsf.App.setBadgeCount(count) - and the TypeScript compiler is entirely happy with this. However, at runtime, the containerjsSsf has an app property (lowercase).

[jleft]

I experienced this issue too (#311).