tests: Replace umodule with module everywhere.

This work was funded through GitHub Sponsors.

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

tests/extmod/framebuf16.py

@@ -1,11 +1,11 @@
 try:
-    import framebuf, usys
+    import framebuf, sys
 except ImportError:
     print("SKIP")
     raise SystemExit
 
 # This test and its .exp file is based on a little-endian architecture.
-if usys.byteorder != "little":
+if sys.byteorder != "little":
     print("SKIP")
     raise SystemExit