Create index on board property of filters db, update gulpfile

gulpfile.js

@@ -202,10 +202,12 @@ async function wipe() {
 	await Posts.db.dropIndexes();
 	await Modlogs.db.dropIndexes();
 	await CustomPages.db.dropIndexes();
+	await Filters.db.dropIndexes();
 	await CustomPages.db.createIndex({ 'board': 1, 'page': 1 }, { unique: true });
 	await Roles.db.createIndex({ 'permissions': 1 }, { unique: true });
 	await Modlogs.db.createIndex({ 'board': 1 });
 	await Files.db.createIndex({ 'count': 1 });
+	await Filters.db.createIndex({ 'board': 1 });
 	await Bans.db.createIndex({ 'ip.cloak': 1 , 'board': 1 });
 	await Bans.db.createIndex({ 'expireAt': 1 }, { expireAfterSeconds: 0 }); //custom expiry, i.e. it will expire when current date > than this date
 	await Bypass.db.createIndex({ 'expireAt': 1 }, { expireAfterSeconds: 0 });