Use new RCUBE_PLUGINS_DIR constant

plugins/password/drivers/dbmail.php

@@ -19,7 +19,7 @@ class rcube_dbmail_password
 {
     function password_save($currpass, $newpass)
     {
-        $curdir   = INSTALL_PATH . 'plugins/password/helpers';
+        $curdir   = RCUBE_PLUGINS_DIR . 'password/helpers';
         $username = escapeshellcmd($_SESSION['username']);
         $args     = rcmail::get_instance()->config->get('password_dbmail_args', '');
 

plugins/password/drivers/sasl.php

@@ -20,7 +20,7 @@ class rcube_sasl_password
 {
     function save($currpass, $newpass)
     {
-        $curdir   = INSTALL_PATH . 'plugins/password/helpers';
+        $curdir   = RCUBE_PLUGINS_DIR . 'password/helpers';
         $username = escapeshellcmd($_SESSION['username']);
         $args     = rcmail::get_instance()->config->get('password_saslpasswd_args', '');
 

plugins/password/drivers/virtualmin.php

@@ -59,7 +59,7 @@ class rcube_virtualmin_password
         $username = escapeshellcmd($username);
         $domain   = escapeshellcmd($domain);
         $newpass  = escapeshellcmd($newpass);
-        $curdir   = INSTALL_PATH . 'plugins/password/helpers';
+        $curdir   = RCUBE_PLUGINS_DIR . 'password/helpers';
 
         exec("$curdir/chgvirtualminpasswd modify-user --domain $domain --user $username --pass $newpass", $output, $returnvalue);
 

plugins/redundant_attachments/redundant_attachments.php

@@ -31,7 +31,7 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-require_once(INSTALL_PATH . 'plugins/filesystem_attachments/filesystem_attachments.php');
+require_once(RCUBE_PLUGINS_DIR . 'filesystem_attachments/filesystem_attachments.php');
 
 class redundant_attachments extends filesystem_attachments
 {