tests: Replace umodule with module everywhere.

This work was funded through GitHub Sponsors.

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

tests/basics/struct_endian.py

@@ -1,13 +1,10 @@
-# test ustruct and endian specific things
+# test struct and endian specific things
 
 try:
-    import ustruct as struct
-except:
-    try:
-        import struct
-    except ImportError:
-        print("SKIP")
-        raise SystemExit
+    import struct
+except ImportError:
+    print("SKIP")
+    raise SystemExit
 
 # unpack/unpack_from with unaligned native type
 buf = b'0123456789'