Small fixes

[Quetzacoalt91]

classes/BluesnapApi.php

• l.124: You could return directly implode(...) instead of storing the value in a temporary variable
• l.207: You could return directly array(...) instead of storing the value in a temporary variable

classes/BluesnapIpn.php

• l.50 & 57: The variables $id_debug_mode and $id_log_name already exist in the parent class. You don't need to define them again in the class BluesnapIpn.