D9300: Store screenMapping info only once

[Andras Mantia]

amantia added reviewers: Plasma, mwolff, hein, broulik.

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D9300

To: amantia, #plasma, mwolff, hein, broulik
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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