Default to current selection for %c wildcard

[kbauer]

Observed behavior

1. Configure ZotFile to "Use sub-folder defined by /%c, i.e. using the collection.
2. Select multiple items, that exist across multiple collections.
3. Manage Attachments > Rename Attachments

For each item separately a popup prompt will be shown for selecting the collection to be used in the new file path.

Requested behavior

When running Manage Attachments > Rename Attachments from within a collection, I would prefer this collection to be chosen automatically.

Motiviation

As it is currently, bulk-renaming files is very difficult when using the %c wildcard.

[darcyalcantara]

+1