fix(material/sidenav): fix tabindex issue on side mode #30979
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remove tabindex=-1 from mat-drawer when in mode="side" so that the mat-drawer container it is not focusable by mobile screen readers such as TalkBack
Before Screencast: https://screencast.googleplex.com/cast/NTYzNjAxNjE0Nzc5MTg3MnwzOGVlNmNmZC1jYQ
After Screencast: https://screencast.googleplex.com/cast/NDg5NzA2MTg1NzEzMjU0NHxjZTcyZGY5MS04OA
fixes b/286459024