fix(common): show description even if child projects specifies path

Previously we didn't show the description for the target if the target
definition specified a an alternate folder, e.g. `:app=src/app`. This
change fixes this.

resources/builder.inc.sh

@@ -866,6 +866,7 @@ builder_describe() {
         IFS="=" read -r -a sub <<< "$value"
         target_path="${sub[@]:1}"
         value="${sub[0]}"
+        original_value="$value"
         if [[ ! -d "$THIS_SCRIPT_PATH/$target_path" ]]; then
           builder_die "Target path '$target_path' for $value does not exist."
         fi