remove useless sprintf call

Author: mathroc

src/Subscriber/TestExecutor.php

@@ -72,8 +72,6 @@ private static function assertThrows(callable $callable, ExpectedFailure $expect
             return;
         }
 
-        throw new \InvalidArgumentException(\sprintf(
-            "Expected to throw \"{$expectedFailure->class}\", got none",
-        ));
+        throw new \InvalidArgumentException("Expected to throw \"{$expectedFailure->class}\", got none");
     }
 }