Reverted previous hotfix

Hotfix not necessary anymore since problem is now address on Wiselib end.

Author: Henning Hasemann

libraries/SD/utility/Sd2Card.cpp

@@ -211,10 +211,6 @@ uint8_t Sd2Card::eraseSingleBlockEnable(void) {
  * can be determined by calling errorCode() and errorData().
  */
 uint8_t Sd2Card::init(uint8_t sckRateID, uint8_t chipSelectPin) {
-  // <HOTFIX>
-  chipSelectPin = 4;
-  // </HOTFIX>
-
   errorCode_ = inBlock_ = partialBlockRead_ = type_ = 0;
   chipSelectPin_ = chipSelectPin;
   // 16-bit init start time allows over a minute