2014-01-05: fix another blind coding error support-scheme-macro-paren-quoting

fix another blind coding error

diff --git a/wisp-guile.w b/wisp-guile.w
--- a/wisp-guile.w
+++ b/wisp-guile.w
@@ -476,7 +476,7 @@ If line starts with one of ' , ` #` #' #
                 line-comment line
             ; otherwise check all possible prefixes
             let : : prefix : car paren-prefixes
-                if : string-prefix? prefix line
+                if : string-prefix? prefix : line-content line
                     list 
                         line-indent line
                         string-append