[android] StripeTerminalReactNativeModule: Fix setting customer

[billfinn-stripe]

Summary

Fix typo with passing params from RN to Android.

Motivation

Fixes #400.

Testing

• I tested this manually

diff --git a/dev-app/src/screens/CollectCardPaymentScreen.tsx b/dev-app/src/screens/CollectCardPaymentScreen.tsx
index 7ca6c9a..0a7a3a0 100644
--- a/dev-app/src/screens/CollectCardPaymentScreen.tsx
+++ b/dev-app/src/screens/CollectCardPaymentScreen.tsx
@@ -153,6 +153,7 @@ export default function CollectCardPaymentScreen() {
       const response = await createPaymentIntent({
         amount: Number(inputValues.amount),
         currency: inputValues.currency,
+        customer: '<REDACTED>',
         paymentMethodTypes: paymentMethods,
         setupFutureUsage: enableInterac ? undefined : 'off_session',
         onBehalfOf: inputValues.connectedAccountId,

Documentation

Select one:

• I have added relevant documentation for my changes.
• This PR does not result in any developer-facing changes.

[chr-stripe]

Can/should we unit test this?

[billfinn-stripe]

Can/should we unit test this?

I responded in DM, but also responding here. We currently don't have unit tests for StripeTerminalReactNativeModule. I'm not sure what the ROI would be. For now, I'm mostly comfortable requiring us to manually test changes to StripeTerminalReactNativeModule.