[MonoDevelop] Fix for complication issue (IndentStyle is readonly)

[gallen at goorooinc.com]

Been trying to compile today's svn all day.  Dunno if this is useful or
not, but I figured I'd attach a short quick patch that works for me.

Index:
main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui.Content/TextEditorProperties.cs
===================================================================
---
main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui.Content/TextEditorProperties.cs	(revision
105610)
+++
main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui.Content/TextEditorProperties.cs	(working
copy)
@@ -117,6 +117,9 @@
 				}
 				return IndentStyle.None;
 			}
+			set {
+				properties.Set("IndentStyle", value);
+			}
 		}
 		
 		public static DocumentSelectionMode DocumentSelectionMode {