Fix checks markup in bug template
Before:
```
Here's some code in backticks
```
After:
``` Here's some code in backticks, which I didn't need, but that's OK :-) ```
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Before:
After:
``` Here's some code in backticks, which I didn't need, but that's OK :-) ```