libview: Open new annotation window only for text annotation

Commit 722b38a2 introduce the automatic opening of new annotation window when a user highlight text. While it is convenient for reviewing articles, it is not for users who only want to highlight text or annotate in some other way.

This commit does not revert the above mentioned commit, but only remove the automatic opening of annotation window when highlighting text. It allows to keep ev_view_annotation_create_show_popup_window for future use.

Fixes #1621 (closed)