fixes minor quirk in PiOS deb postinstall script (Issue #1922)

Author: MAKOMO

src/debian/DEBIAN/postinst

@@ -51,7 +51,7 @@ set_mime()
 
 case "$1" in
    configure)
-   if dpkg-query -W xdg-utils 2>&1 >/dev/null; then
+   if dpkg-query -W xdg-utils | awk '{print $2}' 2>&1 >/dev/null; then
        set_mime;
    fi
    if dpkg-query -W udev 2>&1 >/dev/null; then