Show red shield for users that become unverified

For any users that we previously verified but that are not unverified, we will
now mark them and rooms they are in with a red shield.

Fixes https://github.com/vector-im/riot-web/issues/12808

src/components/views/rooms/MemberTile.js

@@ -121,10 +121,10 @@ export default createReactClass({
         const cli = MatrixClientPeg.get();
         const { userId } = this.props.member;
         const isMe = userId === cli.getUserId();
-        const userVerified = cli.checkUserTrust(userId).isCrossSigningVerified();
-        if (!userVerified) {
+        const userTrust = cli.checkUserTrust(userId);
+        if (!userTrust.isCrossSigningVerified()) {
             this.setState({
-                e2eStatus: "normal",
+                e2eStatus: userTrust.wasCrossSigningVerified() ? "warning" : "normal",
             });
             return;
         }