ev-poppler: drop use of deprecated poppler_page_get_selection_region

Merged Pablo Correa Gomez requested to merge pabloyoyoista/evince:poppler-deprecated into main

It was deprecated in version 0.16. Instead, use poppler_page_get_selected_region. The changes in this commit do not have any behavior change, but the use of the non-deprecated function allows for some code simplification.

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