Fix bug in _read function to use passed parameter rather than class variable

Author: kmatch98

adafruit_focaltouch.py

@@ -129,7 +129,7 @@ def _read(self, register, length, irq_pin=None):
         with self._i2c as i2c:
 
             if irq_pin is not None:
-                while self._irq_pin.value:
+                while irq_pin.value:
                     pass
 
             i2c.write(bytes([register & 0xFF]))