馃崚Revert "Revert "startplasma-wayland: Don't set GDK_SCALE and GDK_DPI_SCALE""

Fushan Wenrequested to merge
cherry-pick-cdf2e1a9 into Plasma/5.27

This reverts commit 34e3efd8 and bd9c257d

CCBUG: 465733 CCBUG: 443215

(cherry picked from commit cdf2e1a9)

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