session: Add newline to end of tests for GH-18634

Author: mintopia

ext/session/tests/gh18634.phpt

@@ -10,4 +10,4 @@ session_start();
 $_SESSION['foo|bar'] = 'value';
 ?>
 --EXPECT--
-Warning: PHP Request Shutdown: Failed to write session data. Data contains invalid key "foo|bar" in Unknown on line 0
+Warning: PHP Request Shutdown: Failed to write session data. Data contains invalid key "foo|bar" in Unknown on line 0

ext/session/tests/gh18634_2.phpt

@@ -11,4 +11,4 @@ $_SESSION['foo|bar'] = 'value';
 session_write_close()
 ?>
 --EXPECTF--
-Warning: session_write_close(): Failed to write session data. Data contains invalid key "foo|bar" in %s on line %d
+Warning: session_write_close(): Failed to write session data. Data contains invalid key "foo|bar" in %s on line %d