Fix usage of unqialified names with cds.db (#378)

test/messaging.test.js

@@ -4,11 +4,13 @@ const _model = '@capire/reviews'
 if (cds.User.default) cds.User.default = cds.User.Privileged // hard core monkey patch
 else cds.User = cds.User.Privileged // hard core monkey patch for older cds releases
 
+const Reviews = 'sap.capire.reviews.Reviews'
+
 describe('cap/samples - Messaging', ()=>{
 
     it ('should bootstrap sqlite in-memory db', async()=>{
         const db = await cds.deploy (_model) .to ('sqlite::memory:')
-        await db.delete('Reviews')
+        await db.delete(Reviews)
         expect (db.model) .not.undefined
     })