Reduced number of bytes read in WMF header (#8964)

Author: hugovk

src/PIL/WmfImagePlugin.py

@@ -81,7 +81,7 @@ class WmfStubImageFile(ImageFile.StubImageFile):
 
     def _open(self) -> None:
         # check placable header
-        s = self.fp.read(80)
+        s = self.fp.read(44)
 
         if s.startswith(b"\xd7\xcd\xc6\x9a\x00\x00"):
             # placeable windows metafile