[Setup] Fix syntax error

setup

@@ -39,7 +39,7 @@ platform=$(echo "$platform" | tr '[:upper:]' '[:lower:]')
 # Get user preference for regenerating the styling
 regen=""
 read -p "Would you like to regenerate styling? (y/N) " regen
-if [ $regen == "y" ]; then
+if [[ "$regen" == "y" ]]; then
     cd build
     node build.js
     if [ $? -ne 0 ]; then