Revert "add command battery"

This reverts commit be45653c2b.

main.c

@@ -1603,18 +1603,6 @@ static void cmd_touchtest(BaseSequentialStream *chp, int argc, char *argv[])
   
 }
 
-static void cmd_battery(BaseSequentialStream *chp, int argc, char *argv[])
-{
-  (void)argc;
-  (void)argv;
-
-  adc_stop(ADC1);
-  int v = adc_vbat_read(ADC1);
-  chprintf(chp, "%d\r\n", v);
-  touch_start_watchdog();
-}
-
-
 static void cmd_frequencies(BaseSequentialStream *chp, int argc, char *argv[])
 {
   int i;
@@ -1797,7 +1785,6 @@ static const ShellCommand commands[] =
     { "test", cmd_test },
     { "touchcal", cmd_touchcal },
     { "touchtest", cmd_touchtest },
-    { "battery", cmd_battery },
     { "pause", cmd_pause },
     { "resume", cmd_resume },
     { "cal", cmd_cal },

nanovna.h

@@ -315,8 +315,6 @@ int config_recall(void);
 
 void clear_all_config_prop_data(void);
 
-int16_t adc_vbat_read(ADC_TypeDef *adc);
-
 /*
  * ui.c
  */