Sysadmin: fix links to GitLab issues search

wiki/src/contribute/working_together/roles/sysadmins.mdwn

@@ -121,11 +121,9 @@ and tasks management:
 * To bring an issue to the attention of system administrators,
   mention the `@sysadmins-team` group.
 * [[!tails_gitlab
-  groups/tails/-/issues?label_name%5B%5D=Core+Work%3ASysadmin+%28maintenance%29
-  desc="issues that should be taken care of as part of sysadmin shifts"]]
-* [[!tails_gitlab
-  groups/tails/-/issues?label_name%5B%5D=Core+Work%3ASysadmin+%28adapt%29
-  desc="issues that are on the sysadmin team's roadmap"]]
+  groups/tails/-/issues?label_name%5B%5D=Core+Work%3ASysadmin
+  desc="issues that should be taken care of as part of sysadmin shifts
+  or are on the sysadmin team's roadmap"]]
 * [[!tails_gitlab
   groups/tails/-/issues?label_name%5B%5D=T%3ASysadmin
   desc="tasks that require *Sysadmin* work"]]