lok: reset and cancel properly Drag & Drop action
used patch from Henry as a template:
https://gerrit.libreoffice.org/c/core/+/118844/17
but without custom actions invocation
Change-Id: I8bce66deffee0de16f3c24f009cfee077eb26e82
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/123243
Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice@gmail.com>
Reviewed-by: Szymon Kłos <szymon.klos@collabora.com>
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/129469
Tested-by: Jenkins
Reviewed-by: Henry Castro <hcastro@collabora.com>