enable mux by default

tools/release/config/vpoint_socks_vmess.json

@@ -28,6 +28,9 @@
           ]
         }
       ]
+    },
+    "mux": {
+      "enabled": true
     }
   },
   "outboundDetour": [
@@ -100,11 +103,5 @@
         }
       ]
     }
-  },
-  "transport": {
-    "kcpSettings": {
-      "uplinkCapacity": 1,
-      "downlinkCapacity": 10
-    }
   }
 }