Revert "Revert "Edit SD Server example to use the new Write(Stream) method""

This reverts commit 163a983.

Author: ficeto

hardware/esp8266com/esp8266/libraries/ESP8266WebServer/examples/SDWebServer/SDWebServer.ino

@@ -111,23 +111,10 @@ bool loadFromSdCard(String path){
     dataType = 0;
     path = 0;
 
-    uint8_t obuf[WWW_BUF_SIZE];
-    
-    while (dataFile.available() > WWW_BUF_SIZE){
-      dataFile.read(obuf, WWW_BUF_SIZE);
-      if(client.write(obuf, WWW_BUF_SIZE) != WWW_BUF_SIZE){
-        DBG_OUTPUT_PORT.println("Sent less data than expected!");
-        dataFile.close();
-        return true;
-      }
-    }
-    uint16_t leftLen = dataFile.available();
-    dataFile.read(obuf, leftLen);
-    if(client.write(obuf, leftLen) != leftLen){
+    if(client.write(dataFile) != dataFile.size()){
       DBG_OUTPUT_PORT.println("Sent less data than expected!");
-      dataFile.close();
-      return true;
     }
+    
     dataFile.close();
     client.stop();
     return true;