Fix warnings and code cleanup/fixes (#13570)

Content.Server/Administration/Managers/RoleBanManager.cs

@@ -115,7 +115,7 @@ public sealed class RoleBanManager
         if (!_cachedRoleBans.TryGetValue(playerUserId, out var roleBans))
             return null;
         return roleBans
-            .Where(ban => ban.Role.StartsWith(JobPrefix))
+            .Where(ban => ban.Role.StartsWith(JobPrefix, StringComparison.Ordinal))
             .Select(ban => ban.Role[JobPrefix.Length..])
             .ToHashSet();
     }

Content.Server/Administration/Systems/AdminVerbSystem.Tools.cs

@@ -826,8 +826,6 @@ public sealed partial class AdminVerbSystem
                     yield return ent;
                 }
             }
-
-            yield break;
         }
 
         else if (HasComp<MapComponent>(target))
@@ -839,8 +837,6 @@ public sealed partial class AdminVerbSystem
                     yield return ent;
                 }
             }
-
-            yield break;
         }
         else
         {