Crash when calulating MD5 for WasmModule when file can't be accessed

[neilenns]

Describe the bug
Mobiflight crashes when calculating the MD5 in WasmModuleUpdater if the file can't be accessed for some reason.

System.IO.IOException: Le fichier APPX n'est pas accessible, car il n'est pas chiffré comme prévu.

   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)
   at MobiFlight.SimConnectMSFS.WasmModuleUpdater.CalculateMD5(String filename)
   at MobiFlight.SimConnectMSFS.WasmModuleUpdater.WasmModulesAreDifferent()

Reported by a user in Discord after they reinstalled MSFS and Mobiflight.

They solved the problem by uninstalling MSFS and rebooting, then installing again.

Not much we can do here other than a try/catch and log an error.