Allow different accounts on same Google account to subscribe to backups.

app/src/main/java/org/thoughtcrime/securesms/backup/v2/ui/subscription/MessageBackupsFlowViewModel.kt

@@ -110,18 +110,6 @@ class MessageBackupsFlowViewModel(
             Log.d(TAG, "Got successful purchase result for purchase at ${result.purchaseTime}")
             val id = internalStateFlow.value.inAppPayment!!.id
 
-            if (result.isAcknowledged) {
-              Log.w(TAG, "Payment is already acknowledged. Ignoring.")
-
-              internalStateFlow.update {
-                it.copy(
-                  stage = MessageBackupsStage.COMPLETED
-                )
-              }
-
-              return@collect
-            }
-
             try {
               Log.d(TAG, "Attempting to handle successful purchase.")