Fix chat channel tags not getting set in and out of the API

src/Tgstation.Server.Host/Controllers/ChatController.cs

@@ -53,7 +53,8 @@ namespace Tgstation.Server.Host.Controllers
 			IrcChannel = api.IrcChannel,
 			IsAdminChannel = api.IsAdminChannel ?? false,
 			IsWatchdogChannel = api.IsWatchdogChannel ?? false,
-			IsUpdatesChannel = api.IsUpdatesChannel ?? false
+			IsUpdatesChannel = api.IsUpdatesChannel ?? false,
+			Tag = api.Tag
 		};
 
 		/// <inheritdoc />

src/Tgstation.Server.Host/Models/ChatChannel.cs

@@ -30,7 +30,8 @@ namespace Tgstation.Server.Host.Models
 			IsAdminChannel = IsAdminChannel,
 			IsWatchdogChannel = IsWatchdogChannel,
 			IsUpdatesChannel = IsUpdatesChannel,
-			IrcChannel = IrcChannel
+			IrcChannel = IrcChannel,
+			Tag = Tag
 		};
 	}
 }