D13845: Fix Enhanced Media Controls disabled state

[Kai Uwe Broulik]

broulik created this revision.
broulik added a reviewer: davidedmundson.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.
broulik requested review of this revision.

REVISION SUMMARY
  When this code ran, settings weren't loaded yet, so the checkbox was always disabled on opening settings.

TEST PLAN
  Opened settings with media controls enabled, enhanced checkbox was enabled.
  Opened settings with media controls disabled, enhanced checkbox was disabled.
  Settings still seem to work fine
  Also ported to `querySelector` instead of `querySelectorAll[0]`

REPOSITORY
  R856 Plasma Browser Integration

REVISION DETAIL
  https://phabricator.kde.org/D13845

AFFECTED FILES
  extension/options.js

To: broulik, davidedmundson
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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