Revert "[nrf fromtree][OpenThread] Disable IPv6 interface during erasing persistent info. (project-chip#33170)"

This reverts commit 16dfe6a.

Signed-off-by: Adrian Gielniewski <adrian.gielniewski@nordicsemi.no>

Author: adigie

src/platform/OpenThread/GenericThreadStackManagerImpl_OpenThread.hpp

@@ -1224,7 +1224,6 @@ void GenericThreadStackManagerImpl_OpenThread<ImplClass>::_ErasePersistentInfo(v
     ChipLogProgress(DeviceLayer, "Erasing Thread persistent info...");
     Impl()->LockThreadStack();
     otThreadSetEnabled(mOTInst, false);
-    otIp6SetEnabled(mOTInst, false);
     otInstanceErasePersistentInfo(mOTInst);
     Impl()->UnlockThreadStack();
 }