river-raid: Routine at 6642

6642: Move player plane left by 2 pixels

Mirrors handle_right but moves the plane 2 pixels left instead of right.
handle_left	6642	LD A,($5F72)	Back up missile coordinates and move plane 2 pixels left.
	6645	LD HL,($5EF3)
	6648	LD ($5F8F),HL
	664B	DEC A
	664C	DEC A
	664D	LD ($5F72),A
	6650	LD C,A
	6651	LD B,$80	Set position and collision mode (FUEL_DEPOT) for rendering.
	6653	LD A,$01
	6655	LD ($5EF5),A
	6658	LD ($8B0C),BC
	665C	INC C	Calculate previous position for sprite erasure (2 pixels back).
	665D	INC C
	665E	LD ($8B0A),BC
	6662	LD BC,$0010	Configure sprite, render plane, and restore state; use ship attributes for Player 2.
	6665	LD HL,($5EF7)
	6668	LD ($8B0E),HL
	666B	LD E,$0E
	666D	LD A,($923D)
	6670	CP $02
	6672	CALL Z,ld_attributes_ship
	6675	LD D,$08
	6677	LD A,$02
	6679	LD HL,$83F1
	667C	CALL render_object
	667F	JP restore_plane_state_after_render