D24388: Mark technology propertie as constant to avoid warning

[Méven Car]

meven created this revision.
meven added reviewers: davidedmundson, Frameworks.
Herald added a project: Frameworks.
Herald added a subscriber: kde-frameworks-devel.
meven requested review of this revision.

REVISION SUMMARY
  To avoid output such as :
  
    QQmlExpression: Expression file:///home/meven/kde/usr/share/kpackage/kcms/kcm_energyinfo/contents/ui/main.qml:479:29 depends on non-NOTIFYable properties:
        Solid::Battery::technology
  
  Similar to D23598 <https://phabricator.kde.org/D23598>

REPOSITORY
  R245 Solid

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D24388

AFFECTED FILES
  src/solid/devices/frontend/battery.h

To: meven, davidedmundson, #frameworks
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
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