Allow GM play roster access

RpgRoller/Components/Pages/WorkspaceState.cs

@@ -109,6 +109,9 @@ public sealed class WorkspaceState
                 return new(SelectedCampaign.Id, SelectedCampaign.Name, SelectedCampaign.RulesetId, SelectedCampaign.Gm,
                     []);
 
+            if (IsCurrentUserGm)
+                return SelectedCampaign;
+
             var ownedCharacters = SelectedCampaign.Characters.Where(character => character.OwnerUserId == User.Id)
                 .ToArray();