fix(icons): add missing comma

custom_components/tuya_local/icons.json

@@ -74,7 +74,7 @@
                             "top": "mdi:arrow-top-right",
                             "middle": "mdi:arrow-right",
                             "down": "mdi:arrow-bottom-right",
-                            "downmost": "mdi:arrow-down"
+                            "downmost": "mdi:arrow-down",
                             "upper_half": "mdi:arrow-expand-up",
                             "lower_half": "mdi:arrow-expand-down",
                             "surround": "mdi:cached"