don't treat watchdog_timeout == 0 as special case

this special treatment is now redundant with enable_watchdog

Firmware/MotorControl/axis.cpp

@@ -202,9 +202,7 @@ void Axis::watchdog_feed() {
 
 // @brief Check the watchdog timer for expiration. Also sets the watchdog error bit if expired.
 bool Axis::watchdog_check() {
-    // reset value = 0 means watchdog disabled.
     if (!config_.enable_watchdog) return true;
-    if (get_watchdog_reset() == 0) return true;
 
     // explicit check here to ensure that we don't underflow back to UINT32_MAX
     if (watchdog_current_value_ > 0) {

Firmware/MotorControl/axis.hpp

@@ -76,7 +76,7 @@ public:
 
         float counts_per_step = 2.0f;
 
-        float watchdog_timeout = 0.0f;  // [s] (0 disables watchdog)
+        float watchdog_timeout = 0.0f; // [s]
         bool enable_watchdog = false;
 
         // Defaults loaded from hw_config in load_configuration in main.cpp