fix(sidenav): hide drawer shadow in 'side' mode

[mmalerba]

No description provided.

[tinayuangao]

LGTM

[mmalerba]

fixes #2674

[andrewseguin]

Was this to match a closer spec to material design? I haven't seen an example of a persistent sidenav that doesn't have any depth/border to it. I don't think this looks as nice as before. I think mat-elevation-16 was overkill but I'd recommend putting in at least mat-elevation-2.

[mmalerba]

@andrewseguin yes this was to match the spec: https://material.io/guidelines/patterns/navigation-drawer.html#navigation-drawer-behavior no reason you can't just add the elevation class in your app though

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