Check for equality rather than inequality

Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>

Author: radarhere

src/PIL/ImageGrab.py

@@ -134,7 +134,10 @@ def grabclipboard() -> Image.Image | list[str] | None:
             import struct
 
             o = struct.unpack_from("I", data)[0]
-            files = data[o:].decode("mbcs" if data[16] == 0 else "utf-16le").split("\0")
+            if data[16] == 0:
+                files = data[o:].decode("mbcs").split("\0")
+            else:
+                files = data[o:].decode("utf-16le").split("\0")
             return files[: files.index("")]
         if isinstance(data, bytes):
             data = io.BytesIO(data)