message: fix: hide OMEMO menu entry for muc
  Don't display "Show OMEMO devices" in chat window menu for group chat contacts.
diff: @@ -2,7 +2,7 @@ import { API as PluginAPI } from '../../plugin/PluginAPI.interface'
  import { EncryptionPlugin } from '../../plugin/EncryptionPlugin'
  import { EncryptionState } from '../../plugin/AbstractPlugin'
  import { IMessage } from '../../Message.interface'
  -import { IContact } from '../../Contact.interface'
  +import { IContact, ContactType } from '../../Contact.interface'
  import Omemo from './lib/Omemo'
  import ChatWindow from '../../ui/ChatWindow'
  import { NS_BASE, NS_DEVICELIST } from './util/Const'
  @@ -33,6 +33,10 @@ export default class OMEMOPlugin extends EncryptionPlugin {
  pluginAPI.addAfterReceiveMessageProcessor(this.afterReceiveMessageProcessor);
  pluginAPI.registerChatWindowInitializedHook((chatWindow: ChatWindow) => {
  + if (chatWindow.getContact().getType() !== ContactType.CHAT) {
  + return;
  + }
  +
  chatWindow.addMenuEntry('omemo-devices', 'OMEMO devices', () => this.openDeviceDialog(chatWindow));
  });
  }
  