Config: clear the 1 kHz tone option read from an old sd_icon_save byte

flash.c

@@ -127,6 +127,10 @@ config_recall(void)
   if (config.sd_icon_save == 0)
     config.sd_icon_save = SDIS_DEFAULT;
 #endif // __USE_SD_CARD__
+#ifdef TINYSA4
+  if (config.wfm_1khz_harmonic > 100)   // v1.4-220 placed it on the old sd_icon_save byte (always >= 0x80)
+    config.wfm_1khz_harmonic = 0;
+#endif
 
   return 0;
 }