Address error on /learn after change of embedding model

[srdas]

Fixes Issue #869

The all_files parameter was not being passed to learn the RAG folder when the embedding provider is changed. This has now been fixed and tested. To test, an initial embedding model is used and /learn is applied.

(See Issue #869 for the error that is addressed below.)

Next, the embedding model is changed on the settings page and /learn is tested again to make sure it is working as expected, as shown:

[3coins]

@srdas
Thanks for fixing this. It might be better to make the default in learn_dir as False, which is the most used option. Also, it seems like that relearn which indexes the files in case the embedding model is changed, should save the all_files option initially passed from the user.

For an immediate fix, let's make all_files default as False, long term let's figure out how to persist the all_files option passed by the user, so that relearn works in the intended way when model is changed.

[srdas]

@srdas Thanks for fixing this. It might be better to make the default in learn_dir as False, which is the most used option. Also, it seems like that relearn which indexes the files in case the embedding model is changed, should save the all_files option initially passed from the user.

For an immediate fix, let's make all_files default as False, long term let's figure out how to persist the all_files option passed by the user, so that relearn works in the intended way when model is changed.

@3coins As suggested, the default in learn_dir is now set to False. This takes care of the bug. Will work on the remaining part of the suggestion.

[3coins]

Looks good, should be ok to merge after the rebase.