fix: "database" option error in driver when use "url" option for connection

Author: CavidM

src/connection/Connection.ts

@@ -517,6 +517,8 @@ export class Connection {
         const migrations = connectionMetadataBuilder.buildMigrations(this.options.migrations || []);
         ObjectUtils.assign(this, { migrations: migrations });
 
+        this.driver.database = <string> this.options.database;
+
         // validate all created entity metadatas to make sure user created entities are valid and correct
         entityMetadataValidator.validateMany(this.entityMetadatas.filter(metadata => metadata.tableType !== "view"), this.driver);
     }