`active` PropTypes on MobileLayout
`active` PropTypes on MobileLayout

Not sure if that is the right approach, but `active` on Panels is being fetched from Mobile, and Mobile treats `active` as bool (L-132), hence I assume the `active` PropTypes is missing the support of boolean.
This should solve the following warning message :
```
vendors~main.fe9333fdaa91c3bc407a.bundle.js:8776 Warning: Failed prop type: Invalid prop `active` of type `boolean` supplied to `<<anonymous>>`, expected `number`.
    in Unknown (created by MobileLayout)
    in MobileLayout (created by ResizeDetector)
    in ResizeDetector
    in Unknown
    in Unknown (created by Manager)
    in ThemeProvider (created by Manager)
    in Manager (created by Context.Consumer)
    in Location (created by QueryLocation)
    in QueryLocation (created by Root)
    in LocationProvider (created by Root)
    in HelmetProvider (created by Root)
    in Root
```
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