ref(e2ee) make tests compatible with new karma/jasmine versions

it removed support for functions being simultaneous async and have done parameter in callback

modules/e2ee/Context.spec.js

             await receiver.setKey(key, 0);
         });
 
-        it('with an audio frame', async done => {
+        it('with an audio frame', done => {
             sendController = {
                 enqueue: encodedFrame => {
                     const data = new Uint8Array(encodedFrame.data);
                 }
             };
 
-            await sender.encodeFunction(makeAudioFrame(), sendController);
+            sender.encodeFunction(makeAudioFrame(), sendController);
         });
 
-        it('with a video frame', async done => {
+        it('with a video frame', done => {
             sendController = {
                 enqueue: encodedFrame => {
                     const data = new Uint8Array(encodedFrame.data);
                 }
             };
 
-            await sender.encodeFunction(makeVideoFrame(), sendController);
+            sender.encodeFunction(makeVideoFrame(), sendController);
         });
     });
 
             };
         });
 
-        it('with an audio frame', async done => {
+        it('with an audio frame', done => {
             receiveController = {
                 enqueue: encodedFrame => {
                     const data = new Uint8Array(encodedFrame.data);
                 }
             };
 
-            await sender.encodeFunction(makeAudioFrame(), sendController);
+            sender.encodeFunction(makeAudioFrame(), sendController);
         });
 
-        it('with a video frame', async done => {
+        it('with a video frame', done => {
             receiveController = {
                 enqueue: encodedFrame => {
                     const data = new Uint8Array(encodedFrame.data);
                 }
             };
 
-            await sender.encodeFunction(makeVideoFrame(), sendController);
+            sender.encodeFunction(makeVideoFrame(), sendController);
         });
 
-        it('the receiver ratchets forward', async done => {
-            // Ratchet the key. We reimport from the raw bytes.
-            const material = await importKey(key);
-
-            await sender.setKey(await ratchet(material), 0);
-
+        it('the receiver ratchets forward', done => {
             receiveController = {
                 enqueue: encodedFrame => {
                     const data = new Uint8Array(encodedFrame.data);
                 }
             };
 
-            await sender.encodeFunction(makeAudioFrame(), sendController);
+            const encodeFunction = async () => {
+                // Ratchet the key. We reimport from the raw bytes.
+                const material = await importKey(key);
+
+                await sender.setKey(await ratchet(material), 0);
+
+                sender.encodeFunction(makeAudioFrame(), sendController);
+            };
+
+            encodeFunction();
         });
     });
 });