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This change hides the help button in the serial port chooser dialog
since the help center page it would automatically navigate to is not yet
available.

Bug: 1085149
Change-Id: I00e2d6523e2a64a28e78675186327afe990fc7a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2619001
Auto-Submit: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Joshua Bell <jsbell@chromium.org>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843331}