Docx reader: don't look to ext tags for image extent.

This was added in 7ff1b798c4
but was mistaken and could cause images to be parsed with
the wrong sizes.

Closes  #11580.

src/Text/Pandoc/Readers/Docx/Parse.hs

@@ -1234,7 +1234,7 @@ elemToExtent el =
     (Just w, Just h) -> Just (w, h)
     _                -> Nothing
  where
-  getDim at = filterElementName (\n -> qName n `elem` ["extent", "ext"]) el
+  getDim at = filterElementName (\n -> qName n == "extent") el
               >>= findAttr (QName at Nothing Nothing) >>= safeRead
 
 

test/command/9391.md

@@ -3,7 +3,7 @@
 ^D
 <p>Lorem ipsum.</p>
 <figure>
-<img src="media/image1.png" style="width:1.10263in;height:1.10263in" />
+<img src="media/image1.png" style="width:1.09702in;height:1.09702in" />
 <figcaption><p>Blue square.</p></figcaption>
 </figure>
 ```