Some style fixes.

src/views/messages-view.jsx

@@ -1442,7 +1442,7 @@ class MessagesView extends React.Component {
         );
       } else if (this.state.rtcPanel) {
         // P2P call.
-        if (this.state.rtcPanel.startsWith("usr")) {
+        if (Tinode.isP2PTopicName(this.state.rtcPanel)) {
           component2 = (
             <CallPanel
               topic={this.state.topic}

src/views/tinode-web.jsx

@@ -1776,7 +1776,7 @@ class TinodeWeb extends React.Component {
     switch (callState) {
       case CALL_STATE_OUTGOING_INITATED:
         const head = { webrtc: CALL_HEAD_STARTED, aonly: !!audioOnly };
-        let msg = Drafty.videoCall(audioOnly);
+        const msg = Drafty.videoCall(audioOnly);
         if (Tinode.isGroupTopicName(callTopic)) {
           // Video conference.
           head.vc = true;
@@ -1873,7 +1873,7 @@ class TinodeWeb extends React.Component {
     }
     if (topic.isSubscribed()) {
       this.handleTopicSelected(setCallTopic ? topicName : this.state.callTopic);
-      let upd = {
+      const upd = {
         callState: CALL_STATE_IN_PROGRESS
       }
       if (setCallTopic) {