KMyMoney correct spelling in widget tooltips

Summary: Correct ToolTip spelling in kmymoney.widgets

Reviewers: tbaumgart

Reviewed By: tbaumgart

Differential Revision: https://phabricator.kde.org/D26612

(cherry picked from commit 9f4a8127b0c4151f6a8f1c213b5bb7a489d6a5d4)