usingSSL changed to useSSL throughout for consistency

setup.sh

@@ -178,11 +178,11 @@ while true; do
     read -p "Do you want to enable SSL on this server? (default: Yes) " yn
     case "${yn}" in
         [Yy]*|'')
-            usingSSL=1
+            useSSL=1
             break
             ;;
         [Nn]*)
-            usingSSL=0
+            useSSL=0
             break
             ;;
         [Xx]*)
@@ -196,7 +196,7 @@ while true; do
 done
 
 # using certbot?
-if [ "${usingSSL}" -eq 1 ]; then
+if [ "${useSSL}" -eq 1 ]; then
     echo -e "\n${mag}If you are using Certbot, you only need to provide the primary domain name"
     echo "of your certificate and the script will auto-generate the paths NGINX needs to"
     echo "make everything work."