PHPC-554: Fix expected exception message in test case

See: a04008e

Author: jmikola

tests/bson/bson-toPHP_error-004.phpt

@@ -35,13 +35,13 @@ foreach ($tests as $bson) {
 <?php exit(0); ?>
 --EXPECTF--
 OK: Got MongoDB\Driver\Exception\UnexpectedValueException
-Detected corrupt BSON data.
+Detected corrupt BSON data
 OK: Got MongoDB\Driver\Exception\UnexpectedValueException
-Detected corrupt BSON data.
+Detected corrupt BSON data
 OK: Got MongoDB\Driver\Exception\UnexpectedValueException
-Detected corrupt BSON data.
+Detected corrupt BSON data
 OK: Got MongoDB\Driver\Exception\UnexpectedValueException
-Detected corrupt BSON data.
+Detected corrupt BSON data
 OK: Got MongoDB\Driver\Exception\UnexpectedValueException
 Detected unknown BSON type 0x65 for fieldname "". Are you using the latest driver?
 ===DONE===