Issue #2933863: Use short array syntax

src/Controller/Report/Cities.php

src/Controller/Report/CityHits.php

src/Controller/Report/Countries.php

src/Controller/Report/DaysOfMonth.php

src/Controller/Report/DaysOfWeek.php

src/Controller/Report/HitDetails.php

src/Controller/Report/Hits.php

src/Controller/Report/Hosts.php

src/Controller/Report/Hours.php

src/Controller/Report/MonthlyHistory.php

src/Controller/Report/Node.php

src/Controller/Report/RecentHits.php

src/Controller/Report/Referers.php

src/Controller/Report/TopPages.php

src/Controller/Report/UserActivity.php

src/EventSubscriber/KernelTerminateSubscriber.php

src/Form/DateFilter.php

src/Form/Referers.php

src/Form/Settings.php

src/Plugin/Block/VisitorsBlock.php