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This CL removes unnecessary tab stops from the bluetooth-page element.
Secondary details that appear in the item viz. On/Off status are
already added in the button's aria description.

Tab stop for policy indicators were left as such since removing this
makes this detail inaccessible to some users.

Bug: 1025414
Change-Id: I40cc98b3871f7cc77a9252b05e39c669ebf12358
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1940813
Commit-Queue: Azeem Arshad <azeemarshad@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722713}