Ensure login doesn't redirect to logout URL

[michael-doubez]

Fixes issue found in #295

Testing done

Live testing:

• login + logout => end on logout page.
• while still on logout page, click on login
  • previous version displays error page about incoherent state
  • new version redirect to root url

Submitter checklist

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2. Ensure that the pull request title represents the desired changelog entry
3. Please describe what you did
4. Link to relevant issues in GitHub or Jira
5. Link to relevant pull requests, esp. upstream and downstream changes
6. Ensure you have provided tests - that demonstrates feature works or fixes the issue

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.37%. Comparing base (9442607) to head (5412b0f).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #303      +/-   ##
============================================
+ Coverage     73.27%   73.37%   +0.09%     
- Complexity      209      210       +1     
============================================
  Files            10       10              
  Lines           872      875       +3     
  Branches        123      124       +1     
============================================
+ Hits            639      642       +3     
  Misses          170      170              
  Partials         63       63              

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