Fix non LGC glyphs in avatars and txt file previews#25529

MorrisJobke merged 2 commits intomasternextcloud/server:masterfrom

fix-non-lgc-glyphs-in-avatars-and-txt-file-previewsnextcloud/server:fix-non-lgc-glyphs-in-avatars-and-txt-file-previewsCopy head branch name to clipboard