Dont set default value for fills rows (backport #2552) (#2553)

Co-authored-by: Adam Fraser <[email protected]>

indexer/packages/postgres/src/db/migrations/migration_files/20240829161445_add_fills_affiliateearnedrevshare.ts

@@ -2,7 +2,7 @@ import * as Knex from 'knex';
 
 export async function up(knex: Knex): Promise<void> {
   await knex.schema.table('fills', (table) => {
-    table.string('affiliateEarnedRevShare').notNullable().defaultTo('0');
+    table.string('affiliateEarnedRevShare');
   });
 }