Fix e2e icons floating above jitsi
Fix e2e icons floating above jitsi

Remove another seemingly redundant z-index

Fixes https://github.com/vector-im/riot-web/issues/7056

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