Fix crash when not using popup
Summary:
m_shortInputCounter is initialized in RSITimer::suggestBreak only.
Non-null m_shortInputCounter is needed in RSITimer::timeout in case of
TimerState::Resting.
In no pop-up mode RSIBreak goes to RSITimer::timeout omitting
RSITimer::suggestBreak which results in trying to tick uninitialized
m_shortInputCounter.
This patch makes sure that m_shortInputCounter is always initialized.
Reviewers: aacid, pino
Differential Revision: https://phabricator.kde.org/D28441