Merge pull request #1600 from IRDonch/fix-models-lst

formula_recognition_demo: fix the model names in models.lst

Author: Roman Donchenko

demos/python_demos/formula_recognition_demo/models.lst

@@ -1,3 +1,3 @@
 # This file can be used with the --list option of the model downloader.
-formula-recognition-medium-scan-????-encoder
-formula-recognition-medium-scan-????-decoder
+formula-recognition-medium-scan-????-im2latex-decoder
+formula-recognition-medium-scan-????-im2latex-encoder