Drop the flag that said the info API was not served on windows

It is served there now, on a pipe, so nothing set the flag any more. It
was also a plain bool written by the first reconcile and by the reload
callback, which was the review's point about it.

- infoSupported, errInfoUnsupported, the Rebind check and the reload
  branch that warned once go

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

localapi/platform_windows.go

@@ -33,11 +33,6 @@ const network = "pipe"
 // exists so a Server is built the same way on every platform.
 var currentUID = func() uint32 { return 0 }
 
-// infoSupported is true here: the pipe's security descriptor is what a mode is on unix,
-// and the group an operator names in the config is the way to open it to other
-// accounts, as it is for the control pipe. The mode itself means nothing to a pipe.
-const infoSupported = true
-
 // listen creates the named pipe at path with a security descriptor that admits the user
 // nebula runs as, SYSTEM and Administrators, and the group acc names, if any, for
 // reading and writing, which is what connecting to a pipe takes. acc's mode means