fix some bugs in B-G431-ESC1 example

[zhangyq-227]

Hi, I find some bugs in B-G432B-ESC1 example when I test.

1. In the loop function, we need a loopFOC() function to start the motor.
2. build_opt.h file need to add "lib_archive=false" to compile correctly in platformIO.
   All changes are verified on my real hardware.
   I‘m sorry, My English is not very good. I look forward to your reply.
   Wish you a happy life.

[runger1101001]

Thank you very much for reporting this! Your English is just fine, I understand you perfectly.

[runger1101001]

I've changed this PR from main to dev branch, we only accept changes to the dev branch.

However, there are also some compilation problems with this PR - I think it doesn't like the lib_archive=false in the build_opts file. Normally this option should be put in your platformio.ini file...

Also your changes to the example file include changing the sensor type, using current sensing, etc... so I think we should restrict the changes just to the bug itself, if possible.

I think if it is ok with you and to save you further work I will manually introduce just the change with the missing loopFOC() in a separate commit.

[runger1101001]

Done, in this PR: #349