Fixed size of 'formula' dialog in Calc

Fixed:
1. Open Calc
2. Open formula dialog
3. Choose AMORDEGRC function or other with >= 4 params
Edit field is covered by other controls

Change-Id: Ie14ff91a17373e11bc8ef6477f4f22c0ea4570c3
Reviewed-on: https://gerrit.libreoffice.org/11035
Reviewed-by: David Tardon <dtardon@redhat.com>
Tested-by: David Tardon <dtardon@redhat.com>