Issue #2334067 by mgifford, LewisNyman: error.svg doesn't have sufficient color contrast

core/misc/icons/e32700/error.svg

core/modules/dblog/css/dblog.module.css

core/modules/filter/filter.api.php

core/modules/filter/filter.module

core/modules/filter/src/Tests/FilterHtmlImageSecureTest.php

core/modules/simpletest/src/Form/SimpletestResultsForm.php

core/modules/system/css/components/form.theme.css

core/modules/system/css/components/messages.theme.css

core/modules/system/css/system.admin.css

core/modules/update/update.report.inc