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Don't load unused Echo JS/CSS on mobile

Authored by Catrope.

Description

Don't load unused Echo JS/CSS on mobile

MobileFrontend has its own implementation of the notifications
flyout, so don't load any of Echo's code. We do still need
ext.echo.nojs on Special:Notifications though.

Bug: T112571
Change-Id: If4d84810070ccd48a8007a3ff80733a7db30fdb3