nixos/x11: Source .xprofile earlier in xsession-wrapper

This allows users to set e.g. XCOMPOSECACHE before it's used.

nixos/modules/services/x11/display-managers/default.nix

@@ -37,6 +37,11 @@ let
       . /etc/profile
       cd "$HOME"
 
+      # Allow the user to execute commands at the beginning of the X session.
+      if test -f ~/.xprofile; then
+          source ~/.xprofile
+      fi
+
       ${optionalString cfg.displayManager.job.logToJournal ''
         if [ -z "$_DID_SYSTEMD_CAT" ]; then
           export _DID_SYSTEMD_CAT=1
@@ -75,11 +80,6 @@ let
 
       ${cfg.displayManager.sessionCommands}
 
-      # Allow the user to execute commands at the beginning of the X session.
-      if test -f ~/.xprofile; then
-          source ~/.xprofile
-      fi
-
       # Start systemd user services for graphical sessions
       /run/current-system/systemd/bin/systemctl --user start graphical-session.target