fixing typo in channel_nir property accessor

Author: bjones14

adafruit_as7341.py

@@ -383,7 +383,7 @@ def channel_clear(self):
         return self._channel_4_data
 
     @property
-    def channel_clear(self):
+    def channel_nir(self):
         """The current reading for the NIR (near-IR) sensor"""
         self._configure_f5_f8()
         return self._channel_5_data