Revert "LaTeX writer: Add keepaspectratio to includegraphics..."

This reverts commit 171187a452.

src/Text/Pandoc/Writers/LaTeX.hs

@@ -1125,12 +1125,7 @@ inlineToLaTeX (Image attr _ (source, _)) = do
                            [d <> text (show dim)]
                          Nothing          ->
                            []
-      -- if we just have a width or a height, we add keepaspectratio:
-      keepaspectratio = case (dimension Height attr, dimension Width attr) of
-                             (Nothing, Just _) -> ["keepaspectratio"]
-                             (Just _, Nothing) -> ["keepaspectratio"]
-                             _ -> []
-      dimList = showDim Width ++ showDim Height ++ keepaspectratio
+      dimList = showDim Width ++ showDim Height
       dims = if null dimList
                 then empty
                 else brackets $ cat (intersperse "," dimList)

test/command/3450.md

@@ -8,5 +8,5 @@
 % pandoc -fmarkdown-implicit_figures -t latex
 ![image](lalune.jpg){height=2em}
 ^D
-\includegraphics[height=2em,keepaspectratio]{lalune.jpg}
+\includegraphics[height=2em]{lalune.jpg}
 ```