rcxml: revise drag-lock behavior and option names

This revises the changes done in 22d319c:
- Cancel defaulting to <dragLock>sticky<dragLock>. So labwc now disables
  drag-lock by default, as libinput does.
- Update the options from [yes|no|sticky] to [timeout|no|yes] to
  emphasize that the "sticky" mode (now "yes") is recommended when using
  drag-lock.

src/config/libinput.c

@@ -1,7 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 #include <string.h>
 #include <strings.h>
-#include "config.h"
 #include "common/mem.h"
 #include "common/list.h"
 #include "common/string-helpers.h"
@@ -19,11 +18,7 @@ libinput_category_init(struct libinput_category *l)
 	l->tap = LIBINPUT_CONFIG_TAP_ENABLED;
 	l->tap_button_map = LIBINPUT_CONFIG_TAP_MAP_LRM;
 	l->tap_and_drag = -1;
-#if HAVE_LIBINPUT_CONFIG_DRAG_LOCK_ENABLED_STICKY
-	l->drag_lock = LIBINPUT_CONFIG_DRAG_LOCK_ENABLED_STICKY;
-#else
 	l->drag_lock = -1;
-#endif
 	l->three_finger_drag = -1;
 	l->accel_profile = -1;
 	l->middle_emu = -1;