Made centering of bootlogo work and removed contraproductiv setScale2x2() in dogm_lcd_implementation.h

Marlin/dogm_lcd_implementation.h

 	} while(u8g.nextPage());
 
   // Show splashscreen
-  int off = (u8g.getWidth() - START_BMPWIDTH) / 2;
+  int offx = (u8g.getWidth() - START_BMPWIDTH) / 2;
+  int offy = (u8g.getHeight() - 18 - START_BMPHEIGHT) / 2;
   int txtX = (u8g.getWidth() - (sizeof(STRING_SPLASH) - 1)*5) / 2; // 5 is fontwidth in pixel
   int txtY = u8g.getHeight() - 10;
 	u8g.firstPage();
 	do {
-    #ifdef START_BMPHIGH
-		  u8g.drawBitmapP(off, off, START_BMPBYTEWIDTH, START_BMPHEIGHT, start_bmp);
-    #else
-      u8g.setScale2x2();
-		  u8g.drawBitmapP(off, off, START_BMPBYTEWIDTH, START_BMPHEIGHT, start_bmp);
-      u8g.undoScale();
-    #endif
+	  u8g.drawBitmapP(offx, offy, START_BMPBYTEWIDTH, START_BMPHEIGHT, start_bmp);
 			
     u8g.setFont(u8g_font_5x8);
 		u8g.drawStr(txtX, txtY, STRING_SPLASH);