Monthly report: drop optional Redmine-specific step

I'm under the impression that nobody felt like doing that recently,
so I won't bother porting this to GitLab.

wiki/src/blueprint/monthly_report.mdwn

@@ -52,8 +52,6 @@ Checklist
 If you feel like it:
 
 - Check [[reports written for sponsors|contribute/reports]]
-- Redmine view of closed issues:
-  - <https://labs.riseup.net/code/projects/tails/issues?query_id=212>
 
 Publishing
 ==========