harktech: drop hardcoded personal print_host IP from SPARKX i7 presets

The SPARKX i7 machine presets shipped (via #13947) with a contributor's
LAN IP (http://10.10.1.39) hardcoded in print_host. Remove it to match
the K2/K2 Pro/K2 Plus presets, which carry no print_host key — LAN
discovery + the crealityprint agent populate the host at add-printer time.

resources/profiles/Creality/machine/Creality SPARKX i7 0.2 nozzle.json

@@ -70,7 +70,6 @@
 	"pellet_modded_printer": "0",
 	"preferred_orientation": "0",
 	"prime_tower_position_type": "Middle Upper",
-	"print_host": "http://10.10.1.39",
 	"printable_area": "0x0,260x0,260x260,0x260",
 	"printable_height": "255",
 	"printer_technology": "FFF",

resources/profiles/Creality/machine/Creality SPARKX i7 0.4 nozzle.json

@@ -70,7 +70,6 @@
 	"pellet_modded_printer": "0",
 	"preferred_orientation": "0",
 	"prime_tower_position_type": "Middle Upper",
-	"print_host": "http://10.10.1.39",
 	"printable_area": "0x0,260x0,260x260,0x260",
 	"printable_height": "255",
 	"printer_technology": "FFF",

resources/profiles/Creality/machine/Creality SPARKX i7 0.6 nozzle.json

@@ -70,7 +70,6 @@
 	"pellet_modded_printer": "0",
 	"preferred_orientation": "0",
 	"prime_tower_position_type": "Middle Upper",
-	"print_host": "http://10.10.1.39",
 	"printable_area": "0x0,260x0,260x260,0x260",
 	"printable_height": "255",
 	"printer_technology": "FFF",

resources/profiles/Creality/machine/Creality SPARKX i7 0.8 nozzle.json

@@ -70,7 +70,6 @@
 	"pellet_modded_printer": "0",
 	"preferred_orientation": "0",
 	"prime_tower_position_type": "Middle Upper",
-	"print_host": "http://10.10.1.39",
 	"printable_area": "0x0,260x0,260x260,0x260",
 	"printable_height": "255",
 	"printer_technology": "FFF",