Collections/Library toolbox: full set of queries not restored in GUI on reloading collections built from config

[aurelienpierre]

This affects the library toolbox (collect.c lib).

1. Go to queries tab,
2. Build a collection from a multi-criteria query (ex: ISO <= 200 AND camera body == "whatever")
3. Close the app and restart it
4. The querying GUI only shows the first querying criterion, not the full list, while the opened collection seems correct.

Problem is the next criteria don't lead to appending their corresponding GUI to collect.c.