__ini_value: fix use of removed constant

_param was removed in preference of the param functions.

cdist/conf/type/__ini_value/files/common.awk

@@ -11,7 +11,7 @@ BEGIN {
     get_param_array("comment-sign", comment_signs)
     comment_sign = comment_signs[0]
 
-    if(system("test -f " (_param "quote")) == 0) {
+    if(system("test -f " (ENVIRON["__object"] "/parameter/quote")) == 0) {
         # quote it now that it only wins checks against quoted values
         value = ("\"" value "\"")
     }