[SCTX-1663] Allow Closed -> Initialized state transition

If a suspend was taken early enough, a VBD may be in the Initialized state. During the resume from the suspend, the VBD's state is moved to Closed, then returned to its original state. Currently, attempting to transition to the Initialized state is not allowed, which will fail, causing an assertion failure and 0xDEAD BSOD.