a8n: Not possible to create manual Campaign in the UI

Created by: mrnugget

• Sourcegraph version: enterprise, current master (2489a78e733ea31569630575135933aa8ff6dc02)

Steps to reproduce:

1. Go to /campaigns/new
2. Select "Manual" in the Type dropdown
3. Try to click Create

Expected behavior:

Campaign is created.

Actual behavior:

Create button is disabled and cannot be clicked.

GIF