move nodeDB::init code into nodeDB constructor (#3455)

src/main.cpp

@@ -556,7 +556,7 @@ void setup()
 
     // We do this as early as possible because this loads preferences from flash
     // but we need to do this after main cpu init (esp32setup), because we need the random seed set
-    nodeDB = NodeDB::init();
+    nodeDB = new NodeDB;
 
     // If we're taking on the repeater role, use flood router and turn off 3V3_S rail because peripherals are not needed
     if (config.device.role == meshtastic_Config_DeviceConfig_Role_REPEATER) {