Fix a typo in the Settings dialog of Heaptrack plugin
Summary: There is typo due to copypasta from the Cppcheck plugin
Reviewers: KDevelop, kdevelop-devel, kfunk
Reviewed By: KDevelop, kfunk
Subscribers: kdevelop-devel
Tags: KDevelop
Differential Revision: https://phabricator.kde.org/D14220