Fix typo

Change-Id: Ia4cad4c7ca97a8230439b94f2fca74324a4dad41
Reviewed-on: https://gerrit.libreoffice.org/70578Reviewed-by: himajin100000 <himajin100000@gmail.com>
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
Tested-by: Julien Nabet <serval2412@yahoo.fr>

chart2/source/controller/chartapiwrapper/TitleWrapper.cxx

@@ -98,7 +98,7 @@ Any WrappedTitleStringProperty::getPropertyValue( const Reference< beans::XPrope
 }
 Any WrappedTitleStringProperty::getPropertyDefault( const Reference< beans::XPropertyState >& /*xInnerPropertyState*/ ) const
 {
-    return uno::Any( OUString() );//default title is a empty String
+    return uno::Any( OUString() );//default title is an empty String
 }
 
 class WrappedStackedTextProperty : public WrappedProperty