move permission-hardening to /usr/bin to make it more easily accessible

debian/security-misc.postinst

@@ -20,8 +20,8 @@ permission_hardening() {
     echo "Running SUID Disabler and Permission Hardener... See also:"
     echo "https://www.kicksecure.com/wiki/SUID_Disabler_and_Permission_Hardener"
     echo ""
-    echo "$0: INFO: run: /usr/libexec/security-misc/permission-hardening"
-    if ! /usr/libexec/security-misc/permission-hardening ; then
+    echo "$0: INFO: run: permission-hardening"
+    if ! permission-hardening ; then
         echo "$0: ERROR: Permission hardening failed." >&2
         return 0
     fi