Make the keypad "5" key send "\E[E" when NumLock is off

Summary:
When NumLock is off the keypad "5" key should send '\E[E' sequence; this
matches xterm behaviour.

BUG: 189116

Reviewers: Konsole, hindenburg

Reviewed By: Konsole, hindenburg

Subscribers: hindenburg, Konsole

Tags: Konsole

Differential Revision: https://phabricator.kde.org/D11958

(cherry picked from commit 2037c36a6467a940e5e5b645be3d9d83fc9f46b9)