Cookies returned with a leading dot are not stored with the leading dot

**Describe the bug**
Cookies returned with a leading dot are not stored with the leading dot

**To Reproduce**
Steps to reproduce the behavior:
1. Make a request that returns a cookie with a domain set with a leading dot.
```
set-cookie: global_access_token=REDACTED; domain=.online.church; path=/; expires=Sun, 02 Aug 2020 14:36:27 GMT; secure
```
2. Observe that the cookie was stored in the Cookie Manager without the leading dot.

**Expected behavior**
Cookie to be stored with leading dot.

**Screenshots**
If applicable, add screenshots to help explain your problem.

**Desktop (please complete the following information):**
- OS: macOS 10.15.6
- Installation Method: dmg
- App Version 2020.3.3

Start by locating the Cookie Manager code that processes the Set-Cookie domain from the reproduction header. Reproduce the request with domain=.online.church, then verify that the stored cookie retains the leading dot and add or update coverage if the relevant test area is found.

Written by the indexing model from the issue text.