plugins/devinput: use correct code printout field precision
plugins/devinput: use correct code printout field precision

ir_code is a 64-bit (16 hex digits) type, but devinput logged it with
8-digit field precision which resulted in printout length varying between
various event types (which are encoded in top 16 bits of a code number).

Print codes with full 16 hex digits so to maintain constant length output.

stb-tester/lirc,stb-tester/lirc,stb-tester/lirc,stb-tester/lirc,stb-tester/lirc,stb-tester/lirc