Bug 1481203 - Fix server scopes on release-mark-as-shipped task. r=mkmelin

The Thunderbird release-mark-as-shipped task fails due to a scope problem.
Task must have a scope that starts with
"project:comm:thunderbird:releng:ship-it:server"

The shipit scriptworker scope documentation at
https://github.com/mozilla-releng/shipitscript/blob/master/SCOPES.md
states that all release branches of Thunderbird need to use
"project:comm:thunderbird:releng:ship-it:server:production"

Differential Revision: https://phabricator.services.mozilla.com/D8481

taskcluster/ci/release-mark-as-shipped/kind.yml

@@ -25,10 +25,10 @@ job-defaults:
     scopes:
         by-release-level:
             production:
-                - project:comm:thunderbird:releng:ship-it:production
+                - project:comm:thunderbird:releng:ship-it:server:production
                 - project:comm:thunderbird:releng:ship-it:action:mark-as-shipped
             staging:
-                - project:comm:thunderbird:releng:ship-it:staging
+                - project:comm:thunderbird:releng:ship-it:server:staging
                 - project:comm:thunderbird:releng:ship-it:action:mark-as-shipped
     run-on-projects: []
     shipping-phase: ship