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Remove custom action code when equivalent to default

Enables Bison to better reason about it, and should improve performance

--- a/src/asm/parser.y

+++ b/src/asm/parser.y

@@ -645,9 +645,7 @@

 rs_uconst	: /* empty */ {

 			$$ = 1;

 		}

-		| uconst {

-			$$ = $1;

-		}

+		| uconst

 ;

 rl		: T_LABEL T_POP_RL rs_uconst {

@@ -1597,18 +1595,18 @@

 		| T_Z80_XOR op_a_r	{ out_AbsByte(0xA8 | $2); }

 ;

-op_mem_ind	: T_LBRACK reloc_16bit T_RBRACK		{ $$ = $2; }

+op_mem_ind	: T_LBRACK reloc_16bit T_RBRACK	{ $$ = $2; }

 ;

-op_hl_ss	: reg_ss			{ $$ = $1; }

+op_hl_ss	: reg_ss

 		| T_MODE_HL T_COMMA reg_ss	{ $$ = $3; }

 ;

-op_a_r		: reg_r				{ $$ = $1; }

-		| T_MODE_A T_COMMA reg_r		{ $$ = $3; }

+op_a_r		: reg_r

+		| T_MODE_A T_COMMA reg_r	{ $$ = $3; }

 ;

-op_a_n		: reloc_8bit			{ $$ = $1; }

+op_a_n		: reloc_8bit

 		| T_MODE_A T_COMMA reloc_8bit	{ $$ = $3; }

 ;