fix(openthread): Fix openthread mtd joiner config

* Fix openthread-core-esp32x-mtd-config.h: OPENTHREAD_CONFIG_JOINER_ENABLE macro value

* On ESP32 MTD devices Joiner role functionality was not working even if 'Joiner enable' was checked in SDK config because 0 was defined in OPENTHREAD_CONFIG_JOINER_ENABLE macro. Value modified to 1 to resolve the issue. Tested and working on ESP32 H2 MTD device.

* Closes: https://github.com/espressif/esp-idf/pull/13473

components/openthread/private_include/openthread-core-esp32x-mtd-config.h

@@ -217,7 +217,7 @@
 #endif // CONFIG_OPENTHREAD_MACFILTER_ENABLE
 
 #if CONFIG_OPENTHREAD_JOINER
-#define OPENTHREAD_CONFIG_JOINER_ENABLE 0
+#define OPENTHREAD_CONFIG_JOINER_ENABLE 1
 #endif
 
 #if CONFIG_OPENTHREAD_DIAG