ScreenPool: don't remove screen in m_redundantScreens before checking

Fushan Wenrequested to merge
work/fuf/PLASMA-WORKSPACE-SP into master

Otherwise the screen might become a fake screen on removal but m_availableScreens doesn't contain the screen.

SENTRY: PLASMA-WORKSPACE-SP Ref: https://crash-reports.kde.org/organizations/kde/issues/3211/

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