Fix input of large unsigned int values (>0x7FFFFFFF)

Summary:
BUG:395225
FIXED-IN:3.1.1

Test Plan: Build this code but test parent: D13473

Reviewers: piggz

Reviewed By: piggz

Subscribers: Kexi-Devel-list

Tags: #kdb

Differential Revision: https://phabricator.kde.org/D13472