add explicit mode to all examples

So people stop complaining when ap starts by default cause they dont know how esp works.

examples/NonBlocking/AutoConnectNonBlocking/AutoConnectNonBlocking.ino

@@ -2,6 +2,7 @@
 WiFiManager wm;
 
 void setup() {
+    WiFi.mode(WIFI_STA); // explicitly set mode, esp defaults to STA+AP    
     // put your setup code here, to run once:
     Serial.begin(115200);
     

examples/NonBlocking/AutoConnectNonBlockingwParams/AutoConnectNonBlockingwParams.ino

@@ -3,6 +3,7 @@ WiFiManager wm;
 WiFiManagerParameter custom_mqtt_server("server", "mqtt server", "", 40);
 
 void setup() {
+    WiFi.mode(WIFI_STA); // explicitly set mode, esp defaults to STA+AP    
     // put your setup code here, to run once:
     Serial.begin(115200);
     

examples/NonBlocking/OnDemandNonBlocking/onDemandNonBlocking.ino

@@ -17,6 +17,7 @@ bool portalRunning      = false;
 bool startAP            = false; // start AP and webserver if true, else start only webserver
 
 void setup() {
+  WiFi.mode(WIFI_STA); // explicitly set mode, esp defaults to STA+AP  
   // put your setup code here, to run once
   Serial.begin(115200);
   Serial.println("\n Starting");