Update __main__.py

Author: mayeut

src/pybase64/__main__.py

@@ -99,9 +99,9 @@ def readall(file: BinaryIO) -> bytes:
     if file == cast(BinaryIO, sys.stdin):
         # Python 3 < 3.9 does not honor the binary flag,
         # read from the underlying buffer
-        if hasattr(file, "buffer"):
-            return cast(BinaryIO, file.buffer).read()
-        return file.read()  # pragma: no cover
+        if hasattr(file, "buffer"):  # pragma: no cover
+            return cast(BinaryIO, file.buffer).read()  # pragma: no cover
+        return file.read()
         # do not close the file
     try:
         data = file.read()