Similar to before, reducing repetition by making .+ the default Regex for a setting

KfChatDotNetBot/Models/BuiltInSettingsModel.cs

@@ -7,7 +7,7 @@ public class BuiltInSettingsModel
     // Model here largely maps to what's in SettingDbModel, the idea is that there's a set of built-in settings that get
     // populated when migrating old JSON configs and updated on start if there's a schema change (e.g. regex changed)
     public required string Key { get; set; }
-    public required string Regex { get; set; }
+    public string Regex { get; set; } = ".+";
     public required string Description { get; set; }
     public string? Default { get; set; }
     public bool IsSecret { get; set; } = false;