Make property identifiers in output of --show-properties consistent

The same property given as argument to --property had a different
name when displayed with --show-properties after using --full-slice
in the same invocation of goto-instrument.

Property identifiers should at least be consistent w.r.t. input
arguments and log file output in the same invocation of a
tool. However, the consistency ends as soon as a goto binary
is stored and used (where they are relabelled). This could be
fixed by storing property identifiers and preventing them from
being touched after loading a goto binary.

Author: peterschrammel

src/goto-instrument/goto_instrument_parse_options.cpp

@@ -1417,9 +1417,6 @@ void goto_instrument_parse_optionst::instrument_goto_program()
       full_slicer(goto_functions, ns);
   }
 
-  // label the assertions
-  label_properties(goto_functions);
-
   // recalculate numbers, etc.
   goto_functions.update();
 }