Refine Home Assistant MQTT Auto Discovery (#3659)

Add a proper device_class (duration) to "uptime"

code/components/jomjol_mqtt/server_mqtt.cpp

@@ -174,14 +174,14 @@ bool MQTThomeassistantDiscovery(int qos) {
 	int aFreeInternalHeapSizeBefore = heap_caps_get_free_size(MALLOC_CAP_8BIT | MALLOC_CAP_INTERNAL);
 
     //                                                   Group | Field            | User Friendly Name | Icon                      | Unit | Device Class     | State Class  | Entity Category
-    allSendsSuccessed |= sendHomeAssistantDiscoveryTopic("",     "uptime",          "Uptime",            "clock-time-eight-outline", "s",   "",                "",            "diagnostic", qos);
+    allSendsSuccessed |= sendHomeAssistantDiscoveryTopic("",     "uptime",          "Uptime",            "progress-clock",           "s",   "duration",        "measurement", "diagnostic", qos);
     allSendsSuccessed |= sendHomeAssistantDiscoveryTopic("",     "MAC",             "MAC Address",       "network-outline",          "",    "",                "",            "diagnostic", qos);
     allSendsSuccessed |= sendHomeAssistantDiscoveryTopic("",     "fwVersion",       "Firmware Version",  "application-outline",      "",    "",                "",            "diagnostic", qos);
     allSendsSuccessed |= sendHomeAssistantDiscoveryTopic("",     "hostname",        "Hostname",          "network-outline",          "",    "",                "",            "diagnostic", qos);
     allSendsSuccessed |= sendHomeAssistantDiscoveryTopic("",     "freeMem",         "Free Memory",       "memory",                   "B",   "",                "measurement", "diagnostic", qos);
     allSendsSuccessed |= sendHomeAssistantDiscoveryTopic("",     "wifiRSSI",        "Wi-Fi RSSI",        "wifi",                     "dBm", "signal_strength", "",            "diagnostic", qos);
     allSendsSuccessed |= sendHomeAssistantDiscoveryTopic("",     "CPUtemp",         "CPU Temperature",   "thermometer",              "°C",  "temperature",     "measurement", "diagnostic", qos);
-    allSendsSuccessed |= sendHomeAssistantDiscoveryTopic("",     "interval",        "Interval",          "clock-time-eight-outline", "min",  ""           ,    "measurement", "diagnostic", qos);
+    allSendsSuccessed |= sendHomeAssistantDiscoveryTopic("",     "interval",        "Interval",          "clock-time-eight-outline", "min",  "",               "measurement", "diagnostic", qos);
     allSendsSuccessed |= sendHomeAssistantDiscoveryTopic("",     "IP",              "IP",                "network-outline",           "",    "",               "",            "diagnostic", qos);
     allSendsSuccessed |= sendHomeAssistantDiscoveryTopic("",     "status",          "Status",            "list-status",               "",    "",               "",            "diagnostic", qos);
     allSendsSuccessed |= sendHomeAssistantDiscoveryTopic("",     "flowstart",       "Manual Flow Start", "timer-play-outline",        "",    "",               "",            "",           qos);