Don't swap bytes when fetching the two channel registers.

This was something I must have blindly copied from somewhere else.  Chris
Satterlee pointed out that it wasn't necessary, based on empirical testing.
(The datasheet backs Chris up, too.  It says that the register values are
little-endian, and the I2C's readU16() method assumes little-endian data.)

Author: asciipip

Adafruit_TSL2561/Adafruit_TSL2561.py

@@ -300,8 +300,8 @@ def _getData(self):
         if self.mode == TSL2561.MODE_SINGLE:
             self._poweron()
             _sleepms(self._integrationTime.time)
-        chan0 = self._i2c.reverseByteOrder(self._i2c.readU16(TSL2561._REGISTER['CHAN0'] | TSL2561._REG_MOD['COMMAND'] | TSL2561._REG_MOD['WORD']))
-        chan1 = self._i2c.reverseByteOrder(self._i2c.readU16(TSL2561._REGISTER['CHAN1'] | TSL2561._REG_MOD['COMMAND'] | TSL2561._REG_MOD['WORD']))
+        chan0 = self._i2c.readU16(TSL2561._REGISTER['CHAN0'] | TSL2561._REG_MOD['COMMAND'] | TSL2561._REG_MOD['WORD'])
+        chan1 = self._i2c.readU16(TSL2561._REGISTER['CHAN1'] | TSL2561._REG_MOD['COMMAND'] | TSL2561._REG_MOD['WORD'])
         if self.mode == TSL2561.MODE_SINGLE:
             self._poweroff()