skel: session: don't autostart keepassxc by default

- when keepassxc starts before xfce4-panel notification area, the window will start minimized but the notification icon will be missing
- a workaround is to restart keepassxc
- bad UX, just disable keepassxc autostart
- use monochrome notification icon

config/includes.chroot/etc/skel/.config/keepassxc/keepassxc.ini

@@ -15,3 +15,4 @@ MinimizeOnClose=true
 MinimizeOnStartup=true
 MinimizeToTray=true
 ShowTrayIcon=true
+TrayIconAppearance=monochrome-light