[Hotfix] No progress output in import functions due to operator priority problem

The progress output in functions _import_exposure and import_from_postgis uses a modulo operator on the dataset count to report every 10000th insert. Due to changes in the last MR, the counting variable is supposed to be increased by 1 but the modulo operator takes priority and thus renders the condition useless.

\rfc @laurens @tara @gislars