✅ 🐛 Improve user input matching mocks and use them

The previous unit tests for the input matching assumed that the user input
would be of the form of the label options, so reused the label options as mock
options. However, they actually are of the form of user input objects with data
and metadata and the input as a label.

We create new mock objects with the correct format, and use them in the tests.

This is the reason why #1150
was not caught for so long.

And when we fixed the code, the test broke.
#1150 (comment)
#1150 (comment)

Testing done:

```
npx jest www/__tests__/confirmHelper.test.ts

Test Suites: 1 passed, 1 total
Tests:       11 passed, 11 total
```

www/__tests__/confirmHelper.test.ts

@@ -45,6 +45,16 @@ const fakeDefaultLabelOptions = {
     },
   },
 };
+const fakeInputs = {
+  MODE: [
+    { data: { label: 'walk', start_ts: 1245, end_ts: 5678}},
+    { data: { label: 'bike', start_ts: 1245, end_ts: 5678}},
+  ],
+  PURPOSE: [
+    { data: {label: 'home', start_ts: 1245, end_ts: 5678 }},
+    { data: {label: 'work', start_ts: 1245, end_ts: 5678 }}
+  ],
+};
 
 jest.mock('../js/services/commHelper', () => ({
   ...jest.requireActual('../js/services/commHelper'),
@@ -62,8 +72,8 @@ describe('confirmHelper', () => {
 
   it('returns base labelInputDetails for a labelUserInput which does not have mode of study', () => {
     const fakeLabelUserInput = {
-      MODE: fakeDefaultLabelOptions.MODE[1],
-      PURPOSE: fakeDefaultLabelOptions.PURPOSE[0],
+      MODE: fakeInputs.MODE[1],
+      PURPOSE: fakeInputs.PURPOSE[0],
     };
     const labelInputDetails = labelInputDetailsForTrip(
       fakeLabelUserInput,
@@ -74,8 +84,8 @@ describe('confirmHelper', () => {
 
   it('returns full labelInputDetails for a labelUserInput which has the mode of study', () => {
     const fakeLabelUserInput = {
-      MODE: fakeDefaultLabelOptions.MODE[0], // 'walk' is mode of study
-      PURPOSE: fakeDefaultLabelOptions.PURPOSE[0],
+      MODE: fakeInputs.MODE[0], // 'walk' is mode of study
+      PURPOSE: fakeInputs.PURPOSE[0],
     };
     const labelInputDetails = labelInputDetailsForTrip(
       fakeLabelUserInput,