Fix Logarithmic vertical axis has multiple zero labels

Summary:
Vertical axis range is now cropped to the value of precision limit.

BUG: 421105
FIXED-IN: 5.0.9

Reviewers: tbaumgart

Reviewed By: tbaumgart

Tags: KMyMoney

Differential Revision: https://phabricator.kde.org/D29480

(cherry picked from commit 462f3dcb13060011b993f88c3a44cd55f6d24bd1)