Removed unused code that created a warning

Author: Randall Flagg

src/LogExpert.Core/Callback/ColumnizerCallback.cs

@@ -7,7 +7,6 @@ public class ColumnizerCallback : LogExpert.ILogLineColumnizerCallback, IAutoLog
         #region Fields
 
         protected ILogWindow _logWindow;
-        protected IPluginRegistry _pluginRegistry;
 
         #endregion
 
@@ -18,9 +17,8 @@ public ColumnizerCallback(ILogWindow logWindow)
             _logWindow = logWindow;
         }
 
-        private ColumnizerCallback(ColumnizerCallback original)
+        private ColumnizerCallback(ColumnizerCallback original):this(original._logWindow)
         {
-            _logWindow = original._logWindow;
             LineNum = original.LineNum;
         }
 
@@ -54,11 +52,6 @@ public ILogLine GetLogLine(int lineNum)
             return _logWindow.GetLine(lineNum);
         }
 
-        public IList<ILogLineColumnizer> GetRegisteredColumnizers()
-        {
-            return _pluginRegistry.RegisteredColumnizers;
-        }
-
         public int GetLineCount()
         {
             return _logWindow._logFileReader.LineCount;