libtracker-sparql: Fix out parameter in VAPI/Vala files

This argument was made nullable in commit 5ea2e77fa. While this sounds
what we want (the argument is nullable in C API and the vmethod). This
makes Vala introduce a double indirection for the out parameter, so
the argument ends up as "glong**" in the generated C code.

Of course, this breaks the interaction with C code and cursor class
definition expecting a "glong*" there, extra points for the C compiler
error being silenced. Undoing these specific changes from that commit
makes Vala and C code agree again about the levels of indirection.

This broke callers that rely on the string length being meaningful,
a glaring known broken case is the portal, as it breaks the
redirection/serialization of cursors to sandboxed apps.

Fixes: https://gitlab.gnome.org/GNOME/tracker/-/issues/282

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