Fix bug in reset that wasn't setting status properly

Removed setting the `_status_last` to the return value as the return result isn't just the status field.
The `_transceive` function is actually setting the `_status_last` as part of the function so there is no need to do anything additional in reset

Author: Chris Bailey

adafruit_mlx90393.py

@@ -386,7 +386,7 @@ def reset(self):
         if self._debug:
             print("Resetting sensor")
         time.sleep(2)
-        self._status_last = self._transceive(bytes([_CMD_RT]))
+        self._transceive(bytes([_CMD_RT]))
         # burn a read post reset
         try:
             self.magnetic