change lozenge color of unsent redacted events to red
change lozenge color of unsent redacted events to red

use css vars so we don't have to repeat the whole lozenge style

matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk