Capturing during screensaver

[XVII]

When using a custom screensaver like https://github.com/aabytt/custom-screensaver-aerial, PicCap 0.4.3 stops capturing.

"board_type": "O22_DVB",
"hardware_id": "HE_DTV_W22O_AFABATAA",
"product_id": "OLED65C2PSC",
"core_os_release": "7.4.0-190108",
"webos_manufacturing_version": "04.40.91",

Disable powerstate check doesn't appear to have any effect.

Related: #88 #54