Minor tweaks for ESP8266

- update was restarting device on some occasions
- a bit of throttling in UI

wled00/json.cpp

@@ -638,7 +638,7 @@ void serializeInfo(JsonObject root)
   root[F("ver")] = versionString;
   root[F("vid")] = VERSION;
   root[F("cn")] = F(WLED_CODENAME);
-  root[F("release")] = FPSTR(releaseString);
+  root[F("release")] = releaseString;
 
   JsonObject leds = root.createNestedObject(F("leds"));
   leds[F("count")] = strip.getLengthTotal();