bugfix(e2ee): frees olm session and rotates key when remote participant disabled e2ee

modules/e2ee/E2EEncryption.js

         case 'e2ee.idKey':
             logger.debug(`Participant ${participant.getId()} updated their id key: ${newValue}`);
             break;
+        case 'e2ee.enabled':
+            if (!newValue && this._enabled) {
+                this._olmAdapter.clearParticipantSession(participant);
+
+                this._rotateKey();
+            }
+            break;
         }
     }
 

modules/e2ee/OlmAdapter.js

         return this._keyIndex;
     }
 
+    /**
+     * Frees the olmData session for the given participant.
+     *
+     */
+    clearParticipantSession(participant) {
+        const olmData = this._getParticipantOlmData(participant);
+
+        if (olmData.session) {
+            olmData.session.free();
+            olmData.session = undefined;
+        }
+    }
+
     /**
      * Internal helper to bootstrap the olm library.
      *
     _onParticipantLeft(id, participant) {
         logger.debug(`Participant ${id} left`);
 
-        const olmData = this._getParticipantOlmData(participant);
-
-        if (olmData.session) {
-            olmData.session.free();
-            olmData.session = undefined;
-        }
+        this.clearParticipantSession(participant);
     }
 
     /**