Simplify check-display test case (New)

[pseudocc]

Description

Simplify code.

Resolved issues

Documentation

Tests

[xanthein]

test job report that uwake can't be found with your modification

sudo: uwake: command not found
Has disaplay attached and screen on
/sys/class/drm/card0-eDP-1/status:connected
/sys/class/drm/card0-eDP-1/dpms:On

[pseudocc]

Perhaps, needs #1292 first.

[xanthein]

With plainbox-provider-pc-sanity 4.0.0~dev313~ubuntu22.04.1 which include the fix in #1292. Test job will still report command not found

=========[ Running job 1 / 1. Estimated time left (at least): 0:00:00 ]=========
---------------[ Check if display is available for the machine ]----------------
ID: com.canonical.certification::miscellanea/check-display_All In One
Category: com.canonical.plainbox::miscellanea
... 8< -------------------------------------------------------------------------
sudo: uwake: command not found
Has disaplay attached and screen on
/sys/class/drm/card0-eDP-1/status:connected
/sys/class/drm/card0-eDP-1/dpms:On

[pseudocc]

Okay, ignore me.