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On the text-to-speech subpage, fix the search tag "TTS voice" appearing
with no voices loaded and the search tag "TTS engines" appearing with
no TTS engines loaded.
On the switch access subpage, fix the "switch access keyboard auto-scan"
search tag appearing when that feature is disabled.

Fixed: 1116553
Change-Id: I6a3c53f3a4eab3a5f28dfcf3bd852b65ab829b85
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2429470
Commit-Queue: Daniel Classon <dclasson@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810960}