Print actual domain instead of grep output of "Binary file /etc/pihole/list.preEventHorizon matches" when a domain with a unicode char is in a source list.

Signed-off-by: Adam Warner <adamw@rner.email>

gravity.sh

@@ -449,7 +449,7 @@ gravity_Whitelist() {
   echo -ne "  ${INFO} ${str}..."
 
   # Print everything from preEventHorizon into whitelistMatter EXCEPT domains in $whitelistFile
-  grep -F -x -v -f "${whitelistFile}" "${piholeDir}/${preEventHorizon}" > "${piholeDir}/${whitelistMatter}"
+  comm -23 "${piholeDir}/${preEventHorizon}" <(sort "${whitelistFile}") > "${piholeDir}/${whitelistMatter}"
 
   echo -e "${OVER}  ${INFO} ${str}"
 }