Update board-definition.json

Remove unnecessary 4-pin tachometer pin definitions.
Previously, the configurator added tachometer fields even for 2-pin fans, which caused a 0 RPM readout on non-tacho setups.

Author: MayorBug

configuration/boards/ldo-orbitool-o2s/board-definition.json

@@ -58,21 +58,15 @@
 			"parameters": {
 				"max_power": 1,
 				"enable_pin": "PB14",
-				"shutdown_speed": 0,
-				"tachometer_pin": "PA14",
-				"tachometer_ppr": 2,
-				"tachometer_poll_interval": 0.00005
+				"shutdown_speed": 0
 			}
 		},
 		"heater_fan": {
 			"name": "toolhead_cooling_fan",
 			"parameters": {
 				"max_power": 1,
 				"cycle_time": 0.0001,
-				"shutdown_speed": 0,
-				"tachometer_pin": "PB12",
-				"tachometer_ppr": 2,
-				"tachometer_poll_interval": 0.00005
+				"shutdown_speed": 0
 			}
 		},
 		"output_pin": {