fix(sidenav): remove dependency on OverlayModule

Removes the dependency between the sidenav and the CDK overlay, because the overlay isn't being used for anything.

Author: crisbeto

src/lib/sidenav/BUILD.bazel

@@ -14,7 +14,6 @@ ng_module(
     "//src/cdk/bidi",
     "//src/cdk/coercion",
     "//src/cdk/keycodes",
-    "//src/cdk/overlay",
     "//src/cdk/scrolling",
     "@rxjs",
   ],