Fixes #3041 - Video not rendering after starting or joinng a call

- not completely sure why this happens but `reportOutgoingCall` interferes with how the WebView gets access to video streams
- the call itself isn't really necessary so removing it is the simplest way forward

ElementX/Sources/Screens/CallScreen/View/CallScreen.swift

@@ -87,6 +87,9 @@ private struct WebView: UIViewRepresentable {
             webView.uiDelegate = self
             webView.navigationDelegate = self
             
+            // https://stackoverflow.com/a/77963877/730924
+            webView.allowsLinkPreview = true
+            
             // Try matching Element Call colors
             webView.isOpaque = false
             webView.backgroundColor = .compound.bgCanvasDefault

ElementX/Sources/Services/ElementCall/ElementCallService.swift

@@ -152,16 +152,6 @@ class ElementCallService: NSObject, ElementCallServiceProtocol, PKPushRegistryDe
         MXLog.info("Call provider did reset: \(provider)")
     }
     
-    func provider(_ provider: CXProvider, perform action: CXStartCallAction) {
-        if let ongoingCallID {
-            provider.reportOutgoingCall(with: ongoingCallID.callKitID, connectedAt: nil)
-        } else {
-            MXLog.error("Failed starting call, missing ongoingCallID")
-        }
-
-        action.fulfill()
-    }
-    
     func provider(_ provider: CXProvider, perform action: CXAnswerCallAction) {
         if let incomingCallID {
             actionsSubject.send(.startCall(roomID: incomingCallID.roomID))