fix web color rendering for mqtt fails

interface/src/mqtt/MqttStatus.ts

@@ -52,5 +52,5 @@ export const mqttPublishHighlight = ({ mqtt_fails }: MqttStatus, theme: Theme) =
   if (mqtt_fails < 10)
     return theme.palette.warning.main;
 
-  return theme.palette.success.main;
+  return theme.palette.error.main;
 }

lib/framework/MqttSettingsService.cpp

@@ -215,6 +215,8 @@ StateUpdateResult MqttSettings::update(JsonObject & root, MqttSettings & setting
         emsesp::EMSESP::mqtt_.set_publish_time(newSettings.publish_time);
     }
 
+    emsesp::EMSESP::mqtt_.reset_publish_fails(); // reset fail counter back to 0
+
     settings = newSettings;
 
     return StateUpdateResult::CHANGED;