Replace F extension with string interpolation

OpenRA.Mods.Common/Lint/CheckNotifications.cs

@@ -56,8 +56,7 @@ namespace OpenRA.Mods.Common.Lint
 
 							if (string.IsNullOrEmpty(type) || !rules.Notifications.TryGetValue(type.ToLowerInvariant(), out var soundInfo) ||
 								!soundInfo.Notifications.ContainsKey(notification))
-								emitError("Undefined notification reference {0}.{1} detected at {2} for {3}".F(
-									type ?? "(null)", notification, traitInfo.GetType().Name, actorInfo.Key));
+								emitError($"Undefined notification reference {type ?? "(null)"}.{notification} detected at {traitInfo.GetType().Name} for {actorInfo.Key}");
 						}
 					}
 				}