Fix sleep/wake not working.

Fixes #42 😁 with the same juju as used in the referenced issue.

adafruit_displayio_ssd1306.py

@@ -127,13 +127,13 @@ def sleep(self) -> None:
         active prior to sleeping. MP can access (update) the built-in display RAM.
         """
         if self._is_awake:
-            self.bus.send(0xAE, b"")  # 0xAE = display off, sleep mode
+            self.bus.send(0xAE, [])  # 0xAE = display off, sleep mode
             self._is_awake = False
 
     def wake(self) -> None:
         """
         Wake display from sleep mode
         """
         if not self._is_awake:
-            self.bus.send(0xAF, b"")  # 0xAF = display on
+            self.bus.send(0xAF, [])  # 0xAF = display on
             self._is_awake = True