2014-11-21: tests: make the string-parens test use correct curly-infix.

tests: make the string-parens test use correct curly-infix.

diff --git a/tests/syntax-strings-parens.w b/tests/syntax-strings-parens.w
--- a/tests/syntax-strings-parens.w
+++ b/tests/syntax-strings-parens.w
@@ -19,5 +19,5 @@ bar] barz {1 + [* 2 2]}
 mara {
 li
 +
-lo (mabba)
+lo - (mabba)
 }