feat: Flysky PL18 Support (#4105)

Co-authored-by: raphaelcoeffic <raphael.coeffic@frafos.com>
Co-authored-by: rotorman <risto.koiva@web.de>
Co-authored-by: Xy201207 <yaoxu@flysky.com>
Co-authored-by: Peter Feerick <peter.feerick@gmail.com>

radio/src/sdcard.cpp

@@ -545,7 +545,7 @@ void sdMount()
 void sdDone()
 {
   TRACE("sdDone");
-  
+
   if (sdMounted()) {
     audioQueue.stopSD();
 
@@ -557,8 +557,10 @@ void sdDone()
     f_close(&g_bluetoothFile);
 #endif
 
-    f_mount(nullptr, "", 0); // unmount SD
+    f_mount(nullptr, "", 0);  // unmount SD
   }
+
+  storageDeInit();
 }
 
 uint32_t sdMounted()