Replace 'FILE_BODY' at the end

It rarely happens, if 'FILE_BODY' contains placeholders, it has to be
the last placeholder to be replaced.

https://bugzilla.gnome.org/show_bug.cgi?id=720886

libgitg/resources/diff-view-html-builder.js

@@ -134,9 +134,9 @@ function diff_file(file, lnstate, data)
 
 	return exec_template(data.file_template, {
 		'STAGEBUTTON': lnstate.stagebutton,
+		'FILE_STATS': file_stats,
 		'FILE_PATH': file_path,
 		'FILE_BODY': file_body,
-		'FILE_STATS': file_stats,
 	});
 }