Remove call to randomSeed() (#2374)

This function causes the new arduino-esp32 core to revert to the pseudorandom behavior specified in Arduino.
Calls to random() automatically use esp_random() if randomSeed or useRealRandomGenerator(false) aren't called.
Tentative fix for #2357

src/platform/esp32/main-esp32.cpp

@@ -85,7 +85,6 @@ void esp32Setup()
 {
     uint32_t seed = esp_random();
     LOG_DEBUG("Setting random seed %u\n", seed);
-    randomSeed(seed); // ESP docs say this is fairly random
 
     LOG_DEBUG("Total heap: %d\n", ESP.getHeapSize());
     LOG_DEBUG("Free heap: %d\n", ESP.getFreeHeap());
@@ -221,4 +220,4 @@ void cpuDeepSleep(uint64_t msecToWake)
 
     esp_sleep_enable_timer_wakeup(msecToWake * 1000ULL); // call expects usecs
     esp_deep_sleep_start();                              // TBD mA sleep current (battery)
-}
+}