Use QStandardPaths::ApplicationsLocation (XDG_*) for open with #3663
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Use QStandardPaths::standardLocations(QStandardPaths::ApplicationsLocation) to get directories to look for desktop files for the open with option instead of hardcoded default dirs.
This might fix #1868 and #3046 for snap and flatpak users since they seem to use custom XDG_DATA_DIRS and XDG_DATA_HOME. Fixes the open with menu on my NixOS.
https://doc.qt.io/qt-5/qstandardpaths.html