Use the same invoke-rc.d detection as postinst script

debian/changelog

@@ -3,8 +3,9 @@ phpldapadmin (1.2.6.7-1) UNRELEASED; urgency=medium
   * New upstream version 1.2.6.7
   * Drop patches released upstream
   * Refresh PHP 8.2 patch
+  * Use the same invoke-rc.d detection as postinst script
 
- -- William Desportes <williamdes@wdes.fr>  Sun, 21 Jan 2024 10:44:52 +0100
+ -- William Desportes <williamdes@wdes.fr>  Sun, 21 Jan 2024 10:51:59 +0100
 
 phpldapadmin (1.2.6.6-2) unstable; urgency=medium
 

debian/postrm

@@ -42,7 +42,7 @@ case "$1" in
     if [ "$res" = "true" ]; then
         for webserver in $restart; do
             webserver=${webserver%,}
-            if [ -x /usr/sbin/invoke-rc.d ]; then
+            if which invoke-rc.d > /dev/null ; then
                 invoke-rc.d $webserver restart
             else
                 /etc/init.d/$webserver restart