- removed Token-level styling for contextual keywords: record, sealed,
permits, non-sealed. Semantic highlighting for these keywords was
already provided with
org.eclipse.jdt.internal.ui.javaeditor.SemanticHighlightings.RestrictedIdentifiersHighlighting.

- fixes #1953

Signed-off-by: Nikifor Fedorov <nikifor.fedorov@arsysop.ru>