Removed 1 instruction from draw_line_down.s 6% performance boost

wip-hugo/routines/line/line_down.s

@@ -52,6 +52,7 @@
 
         jsr pixel_draw ;;only used first pixel. after this relative position is abused
         LDY #$00
+        LDX X_pos
 for_x:
         ;; Paints A to address i btp_mem_pos* + Y
         ;; Y is our Y-pos-chunk-offset.
@@ -68,8 +69,7 @@ move_8px_left:
         LDA #%10000000
         STA byte_to_paint
 increment_pixel_x_end:
-        INC X_pos;; legacy
-        LDX X_pos
+        INX
         CPX X_end
         BEQ end
         ;;If D <  %00000010 00000000:  case_2
@@ -78,7 +78,6 @@ increment_pixel_x_end:
 case_1:; C =1 so we can use !
         Sub_16 >D, <D, >V, <V, ! ; D = D - V
 increment_y_pos:
-        ;Add_16 >btp_mem_pos, <btp_mem_pos, #$01, #$00
         INY
         CPY #$08 ;
         BNE for_x