Watching code cleanup

cista/api.py

@@ -107,8 +107,8 @@ async def watch(req, ws):
         with watching.state.lock:
             q = watching.pubsub[uuid] = asyncio.Queue()
             # Init with disk usage and full tree
-            await ws.send(watching.format_du(watching.state.space))
-            await ws.send(watching.format_tree(watching.state.root))
+            await ws.send(watching.format_space(watching.state.space))
+            await ws.send(watching.format_root(watching.state.root))
         # Send updates
         while True:
             await ws.send(await q.get())