Fix an error in sch_field.cpp I created in bzr 2923 version, that prevent...

Fix an error in sch_field.cpp I created in bzr 2923 version, that prevent compiling with wxWidgets 2.9.1 (was not detected by 2.8.12)

eeschema/sch_field.cpp

@@ -450,7 +450,7 @@ void SCH_FIELD::Rotate( wxPoint rotationPoint )
 wxString SCH_FIELD::GetSelectMenuText() const
 {
     wxString tmp;
-    tmp.Printf( _( "Field %s" ), GetChars(  + GetName() ) );
+    tmp.Printf( _( "Field %s" ), GetChars( GetName() ) );
 
     return tmp;
 }