whisper: Remove server start inside goroutine

whisper/whisperv6/peer_test.go

@@ -220,11 +220,6 @@ func initialize(t *testing.T) {
 			},
 		}
 
-		err = node.server.Start()
-		if err != nil {
-			t.Skipf("failed to start server %d (port may be taken, skipping since there is no handler in test for this, should be ported to simulation framework): error is %v", i, err)
-		}
-
 		nodes[i] = &node
 	}