libtracker-sparql: delete TrackerResource elements one by onewip/carlosg/resource-deletes

Creating a single query for all values to delete can only work if
all values have a match. As soon as a value is already missing,
the query would just bail out as there's no real match.

We want to delete every value individually regardless of other
properties, so decompose the single delete into multiple individual
deletes.

Fixes "Unable to insert multiple values for subject..." warnings
as the insertion queries would rely on single-valued properties being
cleared beforehand.

https://gitlab.gnome.org/GNOME/tracker/issues/28

Closes: #28

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