Minor gCode update for A2L

At the end of loading sequence a short control movement where added. This should prevent grabbing a next plate, when the grabber hook stuck.

This part was added to self-test file (v2) and the app.

; swap swapmod-stl A2L start / v 01-00 20260725

G0 X-40 F8000
G0 Y305 F8000
G0 Y333 F1500
G0 Z20 F10000
G0 Z-20 F10000
G0 Y300 F500

G0 Z320 F10000

G0 Y-1 F500
G0 Y50 F1000
G0 Y290 F5000
G0 Y265 F1000
G0 Y170 F5000
G0 Y10 Z20 F1000
G0 Y334 F3000
G0 Y-1 F3000
G0 Y25 F5000
G0 Y-1 F5000
G0 Y20 F300

G0 Y-1 F1000
G0 Y20 F1000

G0 Y305 F8000
G0 Y333 F500
G0 Y120 F8000

G0 Y-1 F8000
G0 Y30 F500

G28 X Y

;swap end \n

Withdraw from contract