Bash splitting and globin

Signed-off-by: Dan Schaper <dan.schaper@pi-hole.net>

automated install/basic-install.sh

@@ -235,8 +235,8 @@ chooseInterface() {
   # Loop sentinel variable
   local firstLoop=1
 
-  if [[ $(echo ${availableInterfaces} | wc -l) -eq 1 ]]; then
-      PIHOLE_INTERFACE=${availableInterfaces}
+  if [[ $(echo "${availableInterfaces}" | wc -l) -eq 1 ]]; then
+      PIHOLE_INTERFACE="${availableInterfaces}"
       return
   fi