Fix the error-pattern on compile-fail/fail-simple

Recent changes to the fail statement changed the way the parser errors in this
scenario.

src/test/compile-fail/fail-simple.rs

@@ -1,6 +1,6 @@
 // -*- rust -*-
 
-// error-pattern: after expression but found
+// error-pattern:unexpected token
 fn main() {
   fail @ ;
 }