fix(db-postgres): uuid custom db name (#6408)

## Description

Fixes an issue with creating versions when using custom DB names,
`uuid`, and drafts.

---------

Co-authored-by: PatrikKozak <patrik@payloadcms.com>

Author: jmikrut

packages/db-postgres/src/createVersion.ts

@@ -45,8 +45,7 @@ export async function createVersion<T extends TypeWithID>(
 
   const table = this.tables[tableName]
 
-  const relationshipsTable =
-    this.tables[`_${defaultTableName}${this.versionsSuffix}${this.relationshipsSuffix}`]
+  const relationshipsTable = this.tables[`${tableName}${this.relationshipsSuffix}`]
 
   if (collection.versions.drafts) {
     await db.execute(sql`

test/database/config.ts

@@ -157,7 +157,9 @@ export default buildConfigWithDefaults({
           ],
         },
       ],
-      versions: true,
+      versions: {
+        drafts: true,
+      },
     },
   ],
   globals: [