More fixes to Firebird 3 user/password/architecture hell.

Author: asfernandes

src/fbjava-impl/src/main/java/org/firebirdsql/fbjava/impl/DbClassLoader.java

@@ -59,6 +59,7 @@ final class DbClassLoader extends URLClassLoader
 		codeSource = new CodeSource(contextUrl, (Certificate[]) null);
 
 		Properties properties = new Properties();
+		properties.setProperty("user", "SYSDBA");
 		properties.setProperty("isc_dpb_no_db_triggers", "1");
 
 		connection = (FBConnection) DriverManager.getConnection(