fix unit test and apply correct value for machine_end_gcode

Ultimaker origin overrides the value, so the default_value override is not effective causing the unittest fail
additionally the value must be formatted correctly to resolve.

Author: HellAholic

resources/definitions/ultimaker_original_dual.def.json

@@ -55,7 +55,7 @@
         "layer_height_0": { "value": "max(0.2, layer_height)" },
         "machine_center_is_zero": { "default_value": false },
         "machine_depth": { "default_value": 195 },
-        "machine_end_gcode": { "default_value": "M104 T0 S0 ;1st extruder heater off\nM104 T1 S0 ;2nd extruder heater off\nM140 S0 ;heated bed heater off (if you have it)\nG91 ;relative positioning\nG1 E-1 F300  ;retract the filament a bit before lifting the nozzle, to release some of the pressure\nG1 Z+0.5 E-5 X-20 Y-20 F9000 ;move Z up a bit and retract filament even more\nG28 X0 Y0 ;move X/Y to min endstops, so the head is out of the way\nM84 ;steppers off\nG90 ;absolute positioning" },
+        "machine_end_gcode": { "value": "'M104 T0 S0 ;1st extruder heater off\\nM104 T1 S0 ;2nd extruder heater off' + ('\\nM140 S0 ;heated bed heater off' if machine_heated_bed else '') + '\\nG91 ;relative positioning\\nG1 E-1 F300  ;retract the filament a bit before lifting the nozzle, to release some of the pressure\\nG1 Z+0.5 E-5 X-20 Y-20 F9000 ;move Z up a bit and retract filament even more\\nG28 X0 Y0 ;move X/Y to min endstops, so the head is out of the way\\nM84 ;steppers off\\nG90 ;absolute positioning'" },
         "machine_extruder_count": { "default_value": 2 },
         "machine_gcode_flavor": { "default_value": "RepRap (Marlin/Sprinter)" },
         "machine_head_with_fans_polygon":