zeroing: Update start position only on index pulses.

This is per Austin's request:
https://robotics.mvla.net/gerrit/#/c/178/2/frc971/zeroing/zeroing.cc@62

Change-Id: Ic25d1dd24c33f54a7a95b843eb27db56247b8c4e
2 files changed
tree: 10c6848be23bd42b47497f3bfe540b981ab6764e
  1. aos/
  2. doc/
  3. frc971/
  4. output/
  5. vision/
  6. .clang-format
  7. .gitignore
  8. README.txt