Don't turn on backlights during init.

Adafruit_CharLCDPlate/Adafruit_CharLCDPlate.py

@@ -82,7 +82,7 @@ def __init__(self, busnum=-1, addr=0x20, debug=False):
 
         # I2C is relatively slow.  MCP output port states are cached
         # so we don't need to constantly poll-and-change bit states.
-        self.porta, self.portb, self.ddrb = 0, 0, 0b00010000
+        self.porta, self.portb, self.ddrb = 0b011000000, 0b1 , 0b00010000
 
         # Set MCP23017 IOCON register to Bank 0 with sequential operation.
         # If chip is already set for Bank 0, this will just write to OLATB,
@@ -116,8 +116,8 @@ def __init__(self, busnum=-1, addr=0x20, debug=False):
             0b00000000,   # INTCAPB
             self.porta,   # GPIOA
             self.portb,   # GPIOB
-            self.porta,   # OLATA     0 on all outputs; side effect of
-            self.portb ]) # OLATB     turning on R+G+B backlight LEDs.
+            self.porta,   # OLATA
+            self.portb ]) # OLATB
 
         # Switch to Bank 1 and disable sequential operation.
         # From this point forward, the register addresses do NOT match