[effects/screenedge] Use correct blend function
Summary: Glow textures already have the red, green, and blue channels premultiplied by the alpha component (because of QImage), thus we can't use GL_SRC_ALPHA for sfactor in glBlendFunc. BUG: 403570 Test Plan: Before: {F6592391} After: {F6592392} Reviewers: #kwin, davidedmundson Reviewed By: #kwin, davidedmundson Subscribers: kwin Tags: #kwin Differential Revision: https://phabricator.kde.org/D18803
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54e46dbd
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