Remove separate mime for video call messages.

src/widgets/chat-message.jsx

@@ -8,7 +8,6 @@ import Attachment from './attachment.jsx';
 import LetterTile from './letter-tile.jsx';
 import ReceivedMarker from './received-marker.jsx'
 
-import { CALL_MESSAGE_MIME_TYPE } from '../constants.js'
 import { fullFormatter } from '../lib/formatters.js';
 import { isVideoCall, sanitizeUrl } from '../lib/utils.js';
 
@@ -126,7 +125,7 @@ class BaseChatMessage extends React.PureComponent {
 
     let content = this.props.content;
     const attachments = [];
-    if ([Drafty.getContentType(), CALL_MESSAGE_MIME_TYPE].includes(this.props.mimeType) && Drafty.isValid(content)) {
+    if (this.props.mimeType == Drafty.getContentType() && Drafty.isValid(content)) {
       Drafty.attachments(content, (att, i) => {
         if (att.mime == 'application/json') {
           // Don't show json objects as attachments.

src/widgets/contact-list.jsx

@@ -9,7 +9,6 @@ import Contact from './contact.jsx';
 import ContactAction from './contact-action.jsx';
 
 import { makeImageUrl } from '../lib/blob-helpers.js';
-import { isVideoCall } from '../lib/utils.js'
 
 import { MESSAGE_PREVIEW_LENGTH } from '../config.js';
 
@@ -86,7 +85,7 @@ class ContactList extends React.Component {
             if (msg) {
               forwarded = msg.head ? msg.head.forwarded : null;
               deliveryStatus = msg._status || c.msgStatus(msg, true);
-              previewIsVideoCall = msg.head ? isVideoCall(msg.head.mime) : null;
+              previewIsVideoCall = msg.head ? (msg.head.webrtc !== undefined) : null;
               previewIsResponse = msg.from != this.props.myUserId;
               if (msg.content) {
                 preview = typeof msg.content == 'string' ?