fix(fuse): wake the drain when a folder is made (B160)

Queueing a folder's create left the workers asleep until their 30 s idle
poll; every other enqueue woke them. A file's create still waits for the
release that attaches its bytes.

docs/CHANGELOG.md

@@ -48,6 +48,7 @@ by its local id, in the queue, the stored tree and pins alike.
   (B158).
 - **Opening a file right after the daemon restarts no longer fails with "Resource temporarily
   unavailable"** (B159).
+- **A new folder reaches Drive at once**, not up to half a minute later (B160).
 - **A file renamed just as its upload finished keeps its new name.** The mount no longer showed
   the old name, and a second rename no longer failed with "No such file or directory" (B152).
 - **A change that waits for a name to be freed no longer waits seconds after it is.** A rename or