Refactor supervisor module check

Author: relic-se

adafruit_usb_host_mouse/__init__.py

@@ -29,13 +29,6 @@
 # * Adafruit's Register library: https://github.com/adafruit/Adafruit_CircuitPython_Register
 """
 
-try:
-    import supervisor
-except ImportError:
-    BLINKA = True
-else:
-    BLINKA = False
-
 import array
 from traceback import print_exception
 
@@ -223,16 +216,18 @@ def __init__(  # noqa: PLR0913, too many args
         which buttons are currently pressed."""
 
         if tilegrid is not None:
-            if not BLINKA:
+            try:
+                import supervisor
+            except ImportError:
+                self.tilegrid.x, self.tilegrid.y = 0
+            else:
                 self.display_size = (
                     supervisor.runtime.display.width,
                     supervisor.runtime.display.height,
                 )
                 self.tilegrid.x, self.tilegrid.y = (
                     x // 2 for x in self.display_size
                 )  # center cursor in display
-            else:
-                self.tilegrid.x, self.tilegrid.y = 0
         else:
             self._x, self._y = 0, 0