Revert "Add Commit-Queue+3"

This reverts commit f78a9d5c412a06628cb09cbec17e02ea3c184961.

Reason for revert: This is confusing rollers

Original change's description:
> Add Commit-Queue+3
>
> This ensures CQ never shows up as a checkmark but always as "+1" or
> "+2". Nobody has permission to vote CQ+3.
>
> Change-Id: Iaaf6c5a47ac4db02986ccf01f8181fe94ee2822e
> Reviewed-on: https://pigweed-review.googlesource.com/c/Public-Commit-Queue-Projects/+/151910
> Reviewed-by: Taylor Cramer <cramertj@google.com>

TBR=mohrr@google.com,cramertj@google.com

Change-Id: I246cfdeb9f680c0c880ef692794d67dde1ced6ec
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://pigweed-review.googlesource.com/c/Public-Commit-Queue-Projects/+/151995
Reviewed-by: Taylor Cramer <cramertj@google.com>