Fix GrammarRule memory bug (remove .original_name).

10_compiler_i_syntax_analysis/jackcompiler/syntax/parser.py
	-Remove the `original_name` attribute from `GrammarRule`,
	because on-the-fly updating of `GrammarRule.name` was in
	practice undesirable, and, at the same time, incorrectly
	implemented to the extent of causing massive memory consumption
	(simple to fix, but no need to).