ZF-11344: add missing test file

- Added file containing a single latin-1 character for testing

git-svn-id: http://framework.zend.com/svn/framework/standard/trunk@24009 44c647ce-9c0f-0410-b52a-842ac1e357ba

tests/Zend/Filter/_files/latin-1-dash-only.txt

@@ -0,0 +1 @@
+�