[Satellites] Added LEDSAT to the dropdown

Thanks @ve1cwj for pointing out that I missed LEDSAT from the json data file!

assets/json/satellite_data.json

@@ -281,7 +281,7 @@
    },
    "IO-117":{
       "Modes":{
-         "U":[
+         "U/U":[
             {
                "Uplink_Mode":"PKT",
                "Uplink_Freq":"435310000",
@@ -303,6 +303,18 @@
          ]
       }
    },
+   "LEDSAT":{
+      "Modes":{
+         "U/U":[
+            {
+               "Uplink_Mode":"PKT",
+               "Uplink_Freq":"435310000",
+               "Downlink_Mode":"PKT",
+               "Downlink_Freq":"435190000"
+            }
+         ]
+      }
+   },
    "Lilacsat-1":{
       "Modes":{
          "V/U":[