Improve error messsage of Jitsi widget

If openidtoken request fails, show
an error. Also render error a bit nicer
in generic widget load errors.

src/vector/jitsi/index.html

@@ -11,10 +11,12 @@
         <div class="joinConferencePrompt">
             <!-- TODO: i18n -->
             <h2>Jitsi Video Conference</h2>
+            <div id="widgetActionContainer">
                 <button type="button" id="joinButton">Join Conference</button>
             </div>
         </div>
     </div>
+</div>
 <!-- This script is not webpacked, and the script is downloaded at build time -->
 <script src="./jitsi_external_api.min.js"></script>
 </body>

src/vector/jitsi/index.ts

@@ -61,6 +61,7 @@ function processOpenIDMessage(msg) {
             break;
         case 'blocked':
             console.warn('OpenID credentials request was blocked by user.');
+            document.getElementById("widgetActionContainer").innerText = "Failed to load Jitsi widget";
             break;
         default:
            // nothing to do
@@ -142,8 +143,7 @@ function onWidgetMessage(msg) {
         }
     } catch (e) {
         console.error("Error setting up Jitsi widget", e);
-        document.getElementById("jitsiContainer").innerText = "Failed to load Jitsi widget";
-        switchVisibleContainers();
+        document.getElementById("widgetActionContainer").innerText = "Failed to load Jitsi widget";
     }
 })();