Generated MS search lacks body_is_regex=1

[tripleee]

What problem has occurred? What issues has it caused?

When you create a PR from chat, SmokeDetector follows up with search results after a while. However, the generated search fails to specify that the search is for a regular expression. Thus e.g. #10227 has a search which could never work.

(It didn't work anyway for other reasons, but without the "regex" check box, it couldn't have.)

What would you like to happen/not happen?

The generated search should have the regex box ticked. That is,

MS search [here](https://metasmoke.erwaysoftware.com/search?utf8=%E2%9C%93&body=85275+87805%28%3F%23NO+NorAm%29)

should be

MS search [here](https://metasmoke.erwaysoftware.com/search?utf8=%E2%9C%93&body_is_regex=1&body=85275+87805%28%3F%23NO+NorAm%29)