Fixed Plex DVR refresh variables (#39)

* Added use_plexAPI environment variable

* Updated if statement to use env var

root/cronjob.sh

@@ -91,7 +91,7 @@ fi
 # update Plex via API
 if [ "$use_plexAPI" = "yes" ]; then
 	echo "Updating Plex..."
-	if [ -z "$plexIP" ]; then
+	if [ -z "$plexUpdateURL" ]; then
 		echo "no Plex credentials provided"
 	else
 		curl -s -X POST "$plexUpdateURL"

sample.env

@@ -42,5 +42,5 @@ embyID=
 # Guide" link in Plex and then look at the developer tools window. The first request listed should start
 # with "reloadGuide?". Right click the line and go to copy -> Copy link address. Paste the result below as
 # plexUpdateURL. 
-
+use_plexAPI=no
 plexUpdateURL=