[BUG] Playback resumed on laptop's close lid

[Mel_C]

Environment:
- Laptop ASUS X751LB
- Kubuntu 17.10
- SMPlayer Vesrion: 17.7.0 (revision 8599), Qt 5.9.1, MPV 0.26.0

Scenario:
1. Pause playback.
2. Close the lid

Expected result:
Playback stays paused

Actual result:
Playback is resumed and continues until laptop goes to waiting mode (about 5 - 10 seconds)