Hotfix/setup_transaction_id

[ravinderk]

Description

if ( empty( $transaction_id ) || (int) $transaction_id === (int) $this->ID ) {
 	$gateway        = $this->gateway;
 	$transaction_id = apply_filters( "give_get_payment_transaction_id-{$gateway}", $this->ID );
}

In above condition I think (int) $transaction_id === (int) $this->ID comparision is required to set default trasaction id. This PR will remove this extra check from if condition.

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows has proper inline documentation.