R1:bbfc860c6359

Improve aesthetics of commit hook rejection message

Summary: See PHI939. Ref T13216. Make the dragon's companion animal more clearly cow-like.

Test Plan:
Before:

```
\ \__/
\____(Oo)
( (--)
//__\\
// \\
```

After:

```
* \__/
\____(Oo)
( (..)
//___\\
// \\
```

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13216

Differential Revision: https://secure.phabricator.com/D19775