Make the WHERE clauses more explicit

We have shied away from adding the table name to the licence fields in the WHERE clauses on the basis if it works don't fix it. But by adding `chargeVersions.` to all the charge version based ones we hope to make it clearer where the source of each comes from.

app/services/supplementary-billing/fetch-charge-versions.service.js

@@ -36,10 +36,10 @@ async function _fetch (regionId, billingPeriod) {
       'status'
     ])
     .innerJoinRelated('licence')
-    .where('scheme', 'sroc')
-    .whereNotNull('invoiceAccountId')
     .where('includeInSrocSupplementaryBilling', true)
     .where('regionId', regionId)
+    .where('chargeVersions.scheme', 'sroc')
+    .whereNotNull('chargeVersions.invoiceAccountId')
     .where('chargeVersions.startDate', '>=', billingPeriod.startDate)
     .where('chargeVersions.startDate', '<=', billingPeriod.endDate)
     .whereNot('chargeVersions.status', 'draft')