feat(SDFS): Add destructor to clean up resources

Author: Jason2866

libraries/SD/src/SD.h

@@ -26,6 +26,7 @@ class SDFS : public FS {
 
 public:
   SDFS(FSImplPtr impl);
+  ~SDFS();
   bool begin(
     uint8_t ssPin = SS, SPIClass &spi = SPI, uint32_t frequency = 4000000, const char *mountpoint = "/sd", uint8_t max_files = 5, bool format_if_empty = false
   );