ledmatrix: bugfix scrolling

include/ledmatrixdisplay.h

@@ -13,6 +13,6 @@ void refreshTheMatrixDisplay(bool nextPage = false);
 void DrawNumber(String strNum, uint8_t iDotPos = 0);
 uint8_t GetCharFromFont(char cChar);
 uint8_t GetCharWidth(char cChar);
-void ShiftLeft(uint8_t *arr, uint32_t len);
+void ScrollLeft(uint8_t *buf, uint16_t cols, uint16_t rows);
 
 #endif