fix a typo (nim-lang#17417)

* Revert "make system random work in VM"

* fix nim-lang#17380

* attempt to fix bug

* fix

* better

* fix

* a bit

* fix the leaks

* revert

* fix

* better

* follow up nim-lang#17391

* fix

* Update tchannels.nim

* Update tests/stdlib/tchannels.nim

* Update tchannels.nim

* fix a typo

lib/std/channels.nim

@@ -473,7 +473,7 @@ func send*[T](c: Channel[T], src: sink Isolated[T]) {.inline.} =
   discard sendMpmc(c.d, data.addr, sizeof(T), false)
   wasMoved(data)
 
-template send*[T](c: var Channel[T]; src: T) =
+template send*[T](c: Channel[T]; src: T) =
   ## Helper templates for `send`.
   send(c, isolate(src))