add explicit mode to all examples

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

examples/Basic/Basic.ino

@@ -1,6 +1,8 @@
 #include <WiFiManager.h> // https://github.com/tzapu/WiFiManager
 
 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);