[REVIEW] fix for fdo#47307, crash in Insert names dialog

[Markus Mohrhard]

Hey,

[1] prevents a crash in the insert names dialog. ScRangeManagerTable
expects a reference to the range names and therefore using the
temporary object in the insert names dialog is wrong.

This fix is simple and I think we can add it to 3-5.

Regards,
Markus

[1] http://cgit.freedesktop.org/libreoffice/core/commit/?id=bd43abc94d30332d06fad7964bd01dc5f70c22e7