Allow Element Call to use MSC4039 (#32755)

* Allow Element Call to use MSC4039

Allow Element Call to use MSC4039 so it can
download avatars if it can't authenticate with the
server directly.

* Test Allowing Element Call to use MSC4039

---------

Co-authored-by: Valere Fedronic <bill.carson@valrsoft.com>

apps/web/src/stores/widgets/ElementWidgetDriver.ts

@@ -128,6 +128,7 @@ export class ElementWidgetDriver extends WidgetDriver {
             this.allowedCapabilities.add(MatrixCapabilities.MSC4157UpdateDelayedEvent);
             this.allowedCapabilities.add(MatrixCapabilities.MSC4407SendStickyEvent);
             this.allowedCapabilities.add(MatrixCapabilities.MSC4407ReceiveStickyEvent);
+            this.allowedCapabilities.add(MatrixCapabilities.MSC4039DownloadFile);
 
             this.allowedCapabilities.add(
                 WidgetEventCapability.forStateEvent(EventDirection.Receive, EventType.RoomName).raw,

apps/web/test/unit-tests/stores/widgets/ElementWidgetDriver-test.ts

@@ -134,6 +134,7 @@ describe("ElementWidgetDriver", () => {
             "org.matrix.msc4157.update_delayed_event",
             "org.matrix.msc4407.send.sticky_event",
             "org.matrix.msc4407.receive.sticky_event",
+            "org.matrix.msc4039.download_file",
             // RTC decline events (send/receive, unstable/stable)
             "org.matrix.msc2762.send.event:org.matrix.msc4310.rtc.decline",
             "org.matrix.msc2762.send.event:m.rtc.decline",