presence tests: Fill in other ClientPresences next to aggregateds

Every UserPresence is supposed to have an `aggregated` key, and soon
we'll bring Flow into this file to help us make sure we include it.

But UserPresence has another requirement, and I'm not sure if
there's a nice way to get Flow to help with it: it's *also* supposed
to have one or more other `ClientPresence`s that `aggregated` is
aggregated across.

So, in this separate commit before bringing in Flow, fill in a
`ClientPresence` next to each `aggregated` that doesn't have one.

Author: chrisbobbe

src/presence/__tests__/presenceReducer-test.js

@@ -15,11 +15,8 @@ describe('presenceReducer', () => {
     test('when `presence` data is provided init state with it', () => {
       const presenceData = {
         '[email protected]': {
-          aggregated: {
-            client: 'website',
-            status: 'active',
-            timestamp: 123,
-          },
+          aggregated: { client: 'website', status: 'active', timestamp: 123 },
+          website: { client: 'website', status: 'active', timestamp: 123 },
         },
       };
       const prevState = deepFreeze({});
@@ -39,11 +36,8 @@ describe('presenceReducer', () => {
     test('when no `presence` data is given reset state', () => {
       const prevState = deepFreeze({
         '[email protected]': {
-          aggregated: {
-            client: 'website',
-            status: 'active',
-            timestamp: 123,
-          },
+          aggregated: { client: 'website', status: 'active', timestamp: 123 },
+          website: { client: 'website', status: 'active', timestamp: 123 },
         },
       });
       const action = deepFreeze({
@@ -62,10 +56,8 @@ describe('presenceReducer', () => {
     test('merges a single user in presence response', () => {
       const presence = {
         '[email protected]': {
-          aggregated: {
-            status: 'active',
-            timestamp: 123,
-          },
+          aggregated: { status: 'active', timestamp: 123 },
+          website: { status: 'active', timestamp: 123 },
         },
       };
       const action = deepFreeze({
@@ -80,10 +72,8 @@ describe('presenceReducer', () => {
 
       const expectedState = {
         '[email protected]': {
-          aggregated: {
-            status: 'active',
-            timestamp: 123,
-          },
+          aggregated: { status: 'active', timestamp: 123 },
+          website: { status: 'active', timestamp: 123 },
         },
       };
 
@@ -100,11 +90,8 @@ describe('presenceReducer', () => {
 
       const presence = {
         '[email protected]': {
-          aggregated: {
-            client: 'website',
-            status: 'active',
-            timestamp: 123,
-          },
+          aggregated: { client: 'website', status: 'active', timestamp: 123 },
+          website: { client: 'website', status: 'active', timestamp: 123 },
         },
         '[email protected]': {
           website: {
@@ -122,11 +109,8 @@ describe('presenceReducer', () => {
 
       const expectedState = {
         '[email protected]': {
-          aggregated: {
-            client: 'website',
-            status: 'active',
-            timestamp: 123,
-          },
+          aggregated: { client: 'website', status: 'active', timestamp: 123 },
+          website: { client: 'website', status: 'active', timestamp: 123 },
         },
         '[email protected]': {
           website: {