Do not clone the XmlWriterSettings

The XML writer settings are created when building the `Log4NetTextFormatterOptions` instance and can't be altered after that through the public API.

Author: 0xced

src/Log4NetTextFormatterOptions.cs

@@ -13,8 +13,7 @@ internal Log4NetTextFormatterOptions(IFormatProvider? formatProvider, CDataMode
             FormatProvider = formatProvider;
             CDataMode = cDataMode;
             Log4NetXmlNamespace = log4NetXmlNamespace;
-            // ReSharper disable once ConstantConditionalAccessQualifier
-            XmlWriterSettings = xmlWriterSettings?.Clone() ?? throw new ArgumentNullException(nameof(xmlWriterSettings));
+            XmlWriterSettings = xmlWriterSettings ?? throw new ArgumentNullException(nameof(xmlWriterSettings));
             FilterProperty = filterProperty ?? throw new ArgumentNullException(nameof(filterProperty));
             FormatException = formatException ?? throw new ArgumentNullException(nameof(formatException));
         }