fix(cpp): remove keywords.wit from expected failures

The keywords.wit test now passes due to proper C++ keyword escaping.

Author: ricochet

crates/test/src/cpp.rs

@@ -53,7 +53,6 @@ impl LanguageMethods for Cpp {
             | "import-func.wit"
             | "issue573.wit"
             | "issue929-no-export.wit"
-            | "keywords.wit"
             | "lift-lower-foreign.wit"
             | "lists.wit"
             | "multiversion"