Change /var/run/shm to /dev/shm

The /var directory may not exist (does not exist on Fedora 29), and is
simply a symlink to /dev/shm.

Signed-off-by: Mcat12 <newtoncat12@yahoo.com>

advanced/Scripts/piholeDebug.sh

@@ -76,7 +76,7 @@ WEB_SERVER_CONFIG_DIRECTORY="/etc/lighttpd"
 HTML_DIRECTORY="/var/www/html"
 WEB_GIT_DIRECTORY="${HTML_DIRECTORY}/admin"
 #BLOCK_PAGE_DIRECTORY="${HTML_DIRECTORY}/pihole"
-SHM_DIRECTORY="/var/run/shm"
+SHM_DIRECTORY="/dev/shm"
 
 # Files required by Pi-hole
 # https://discourse.pi-hole.net/t/what-files-does-pi-hole-use/1684