pw_web_ui: Add `baudRate` in additon to `baudrate` to serial options
pw_web_ui: Add `baudRate` in additon to `baudrate` to serial options

On some versions of Chrome (such as on Chromebooks), the options used to
open a serial port use `baudRate` instead of `baudrate` to indicate the
baud rate of the connection. This CL adds `baudRate` to the default
options.

Change-Id: I7146d551210d41bf31ed53b842e59dae44127920
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/18685
Reviewed-by: Paul Mathieu <8791b1cecbf562cc74a5b7acb099775bda2b56a0@google.com>
Pigweed-Auto-Submit: Matthew Soulanille <9273a5b6411e133f7ea896903afbea22cf1c62ad@google.com>
Commit-Queue: Auto-Submit <14637eda5603879df170705285bf30f5996692f0@pigweed.google.com.iam.gserviceaccount.com>

google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed