fancontroller: remove weird minus (commaai#35983)

* fancontroller: remove weird minus

* another minus

Author: haraschax

system/hardware/fan_controller.py

@@ -21,16 +21,16 @@ def __init__(self) -> None:
     self.controller = PIDController(k_p=0, k_i=4e-3, k_f=1, rate=(1 / DT_HW))
 
   def update(self, cur_temp: float, ignition: bool) -> int:
-    self.controller.neg_limit = -(100 if ignition else 30)
-    self.controller.pos_limit = -(30 if ignition else 0)
+    self.controller.pos_limit = 100 if ignition else 30
+    self.controller.neg_limit = 30 if ignition else 0
 
     if ignition != self.last_ignition:
       self.controller.reset()
 
-    error = 75 - cur_temp
-    fan_pwr_out = -int(self.controller.update(
+    error = cur_temp - 75
+    fan_pwr_out = int(self.controller.update(
                       error=error,
-                      feedforward=np.interp(cur_temp, [60.0, 100.0], [0, -100])
+                      feedforward=np.interp(cur_temp, [60.0, 100.0], [0, 100])
                     ))
 
     self.last_ignition = ignition