Merge branch '6681-set-path-variable-in-update-script' into 'develop'

Resolve "Set PATH variable in update script"

Closes #6681

See merge request ispconfig/ispconfig3!1875

Author: Till Brehm

server/scripts/update_runner.sh

@@ -1,5 +1,7 @@
 #!/bin/bash
 
+PATH=/sbin:/usr/sbin:/bin:/usr/bin:/usr/local/sbin:/usr/local/bin:/usr/X11R6/bin
+
 _UPD=1
 
 # padding handles script being overwritten during updates