Force BANK bit to 0 via suggested method.

Author: Red-M

adafruit_mcp230xx/mcp23017.py

@@ -259,8 +259,7 @@ def io_control(self):
 
     @io_control.setter
     def io_control(self, val):
-        val |= 0b000001
-        val ^= 0b000001
+        val &= ~0x80
         self._write_u8(_MCP23017_IOCON, val)
 
     @property

adafruit_mcp230xx/mcp23s17.py

@@ -263,8 +263,7 @@ def io_control(self):
 
     @io_control.setter
     def io_control(self, val):
-        val |= 0b000001
-        val ^= 0b000001
+        val &= ~0x80
         self._write_u8(_MCP23S17_IOCON, val)
 
     @property