Re-randomizing doesn't update audience displays

**Describe the bug**
When a field is re-randomized, the audience display doesn't update until the "show random" button is clicked again.

**To Reproduce**
Steps to reproduce the behavior:
1. Randomized a field
2. Click "show random" (have audience display open to see)
3. Re-randomize field
4. If field randomization changes, field displays and scoring tablets will reflect change, but audience display won't.
5. Click "show random" to show the new random state

**Expected behavior**
Audience display should update automatically with field and tablet displays to avoid confusion.

**Device (please complete the following information):**
- OS: Windows 10
- Browser: Chrome
- Version: 5.0.6