fix Shift+Click convert button to select output directory renaming

[VampiroMedicado]

• Fix Disable file renaming for files with the same extension when input and output folders are different  #652

Add missing options dictionary parameter to allow search on a different folder for files with the same name.

Reporter confirmed that the behaviour is now working correctly: #652 (comment)

[axu2]

Looks good!
Edited the PR title to make it more clear to ordinary users when they see the changelog.
Edited the first post to link it to the issue with magic fix word with formatting like:

- fix #652