clean: remove unnecessary clearing of WinFormsTextBox

Author: trgiangv

source/RevitDevTool/ViewModel/TraceLogViewModel.cs

@@ -55,8 +55,6 @@ partial void OnIsStartedChanged(bool value)
             StartTracing();
         else
             StopTracing();
-        
-        _winFormsTextBox.Clear();
     }
 
     private void StartTracing()
@@ -146,14 +144,10 @@ private void OnThemeChanged(ApplicationTheme theme, System.Windows.Media.Color a
                 RestartLogging();
             }
         });
-        
-        Trace.TraceInformation("Theme changed to {0}", theme);
     }
 
     private void RestartLogging()
     {
-        _winFormsTextBox.Clear();
-        
         UnregisterTraceListeners();
         DisposeLogger();
         InitializeLogger();