Change issue reference to the correct number

Wrongly referenced issue 278 before instead of 270

Author: Donien

changelogs/fragments/fix_issue_278.yml renamed to changelogs/fragments/fix_issue_270.yml

@@ -1,3 +1,3 @@
 ---
 bugfixes:
-  - Fixed issue where reusing the repos role within the monitoring_plugins could cause the deactivation of the repos; using standalone task now (#278)
+  - Fixed issue where reusing the repos role within the monitoring_plugins could cause the deactivation of the repos; using standalone task now (#270)