Fix AO-123 mode from U/V to V/U in satellite data

Corrected the transponder mode for AO-123 in satellite_data.json to reflect the proper V/U configuration.

Fixes #3346

assets/json/satellite_data.json

@@ -121,7 +121,7 @@
    },
    "AO-123":{
       "Modes":{
-         "U/V":[
+         "V/U":[
             {
                "Uplink_Mode":"FM",
                "Uplink_Freq":"145850000",