DaggerWebDash: Use gethostname

Author: jpsamaroo

Diff for: lib/DaggerWebDash/src/d3.jl

@@ -311,7 +311,7 @@ end
 function worker_host_port(id::Int, port::Int, port_range::UnitRange)
     worker_host = get!(D3R_WORKER_HOST_MAP, port) do
         worker_host, worker_port = remotecall_fetch(id, port) do port
-            (MemPool.host, get_actual_port(port, port_range))
+            (gethostname(), get_actual_port(port, port_range))
         end
         D3R_WORKER_PORT_MAP[port] = worker_port
         worker_host