Fixes Matter over WiFi to disable OpenThread (espressif#232)

* Fixes Matter over WiFi to disable OpenThread

* fix flag value

* disables Matter Stack WiFi manager

* rollback Matter WiFi Manager changes

Author: SuGlider

configs/defconfig.esp32c6

@@ -34,3 +34,6 @@ CONFIG_OPENTHREAD_NETWORK_EXTPANID="dead00beef00cafe"
 CONFIG_OPENTHREAD_NETWORK_MASTERKEY="00112233445566778899aabbccddeeff"
 CONFIG_OPENTHREAD_NETWORK_PSKC="104810e2315100afd6bc9215a6bfac53"
 # end of OpenThread
+
+# Matter shall use only WiFi
+CONFIG_ENABLE_MATTER_OVER_THREAD=n