feat: Convert PPM_UNIT build option to runtime radio setting (#3993)

radio/src/gui/128x64/radio_setup.cpp

@@ -107,6 +107,7 @@ enum {
   CASE_PXX1(ITEM_RADIO_SETUP_COUNTRYCODE)
   ITEM_RADIO_SETUP_LANGUAGE,
   ITEM_RADIO_SETUP_IMPERIAL,
+  ITEM_RADIO_SETUP_PPM,
   IF_FAI_CHOICE(ITEM_RADIO_SETUP_FAI)
   ITEM_RADIO_SETUP_SWITCHES_DELAY,
   ITEM_RADIO_SETUP_USB_MODE,
@@ -202,7 +203,7 @@ void menuRadioSetup(event_t event)
     CASE_GPS(0)
     0, CASE_GPS(0)
     CASE_PXX1(0)
-    0, 0, IF_FAI_CHOICE(0)
+    0, 0, 0, IF_FAI_CHOICE(0)
     0,
     0, // USB mode
     CASE_JACK_DETECT(0) // Jack mode
@@ -671,6 +672,10 @@ void menuRadioSetup(event_t event)
         g_eeGeneral.imperial = editChoice(LCD_W-2, y, STR_UNITS_SYSTEM, STR_VUNITSSYSTEM, g_eeGeneral.imperial, 0, 1, attr|RIGHT, event);
         break;
 
+      case ITEM_RADIO_SETUP_PPM:
+        g_eeGeneral.ppmunit = editChoice(LCD_W-2, y, STR_UNITS_PPM, STR_PPMUNIT, g_eeGeneral.ppmunit, PPM_PERCENT_PREC0, PPM_US, attr|RIGHT, event);
+        break;
+
 #if defined(FAI_CHOICE)
       case ITEM_RADIO_SETUP_FAI:
         editCheckBox(g_eeGeneral.fai, LCD_W-9, y, "FAI Mode", attr, event);