fix(wifi): correct matching requests made from browsers

Example Message Exchange:
https://www.rfc-editor.org/rfc/rfc9110.html#section-3.9

Author: pzygielo

libraries/WiFi/examples/SimpleWiFiServer/SimpleWiFiServer.ino

@@ -99,10 +99,10 @@ void loop(){
         }
 
         // Check to see if the client request was "GET /H" or "GET /L":
-        if (currentLine.endsWith("GET /H")) {
+        if (currentLine.startsWith("GET /H")) {
           digitalWrite(5, HIGH);               // GET /H turns the LED on
         }
-        if (currentLine.endsWith("GET /L")) {
+        if (currentLine.startsWith("GET /L")) {
           digitalWrite(5, LOW);                // GET /L turns the LED off
         }
       }

libraries/WiFi/examples/WiFiAccessPoint/WiFiAccessPoint.ino

@@ -84,10 +84,10 @@ void loop() {
         }
 
         // Check to see if the client request was "GET /H" or "GET /L":
-        if (currentLine.endsWith("GET /H")) {
+        if (currentLine.startsWith("GET /H")) {
           digitalWrite(LED_BUILTIN, HIGH);               // GET /H turns the LED on
         }
-        if (currentLine.endsWith("GET /L")) {
+        if (currentLine.startsWith("GET /L")) {
           digitalWrite(LED_BUILTIN, LOW);                // GET /L turns the LED off
         }
       }