Persist FTP/SFTP debug log preference

-Commit/apply FtpDebug_key state to persistent preferences
-Configure SFTP/JSch logging based on FtpDebug_key/LogFilename
 state on app startup

src/keepass2android/app/App.cs

@@ -832,7 +832,7 @@ namespace keepass2android
 						    new OneDrive2FullFileStorage(),
 						    new OneDrive2MyFilesFileStorage(),
 						    new OneDrive2AppFolderFileStorage(),
-                            new SftpFileStorage(LocaleManager.LocalizedAppContext, this),
+                            CreateSftpFileStorage(),
 							new NetFtpFileStorage(LocaleManager.LocalizedAppContext, this, IsFtpDebugEnabled),
 							new WebDavFileStorage(this),
 							new PCloudFileStorage(LocaleManager.LocalizedAppContext, this),
@@ -855,6 +855,28 @@ namespace keepass2android
 				.GetBoolean(LocaleManager.LocalizedAppContext.GetString(Resource.String.FtpDebug_key), false);
         }
 
+		private IFileStorage CreateSftpFileStorage()
+		{
+			Context ctx = LocaleManager.LocalizedAppContext;
+            SftpFileStorage fileStorage = new SftpFileStorage(ctx, this);
+
+            var storage = new SftpStorage(ctx);
+            if (IsFtpDebugEnabled())
+			{
+                string? logFilename = null;
+                if (Kp2aLog.LogToFile)
+                {
+                    logFilename = Kp2aLog.LogFilename;
+                }
+                storage.SetJschLogging(true, logFilename);
+            } else
+			{
+				storage.SetJschLogging(false, null);
+			}
+
+			return fileStorage;
+		}
+
 		public void TriggerReload(Context ctx, Action<bool> actionOnResult)
 		{
 			Handler handler = new Handler(Looper.MainLooper);

src/keepass2android/settings/DatabaseSettingsActivity.cs

@@ -401,7 +401,11 @@ namespace keepass2android
 #if !EXCLUDE_JAVAFILESTORAGE && !NoNet
         private void OnJSchDebugChanged(object sender, Preference.PreferenceChangeEventArgs e)
         {
-            SetJSchLogging((bool)e.NewValue);
+            bool debugEnabled = (bool)e.NewValue;
+            SetJSchLogging(debugEnabled);
+
+            string prefKey = Application.Context.GetString(Resource.String.FtpDebug_key);
+            PreferenceManager.SharedPreferences.Edit().PutBoolean(prefKey, debugEnabled).Apply();
         }
 
         private void SetJSchLogging(bool enabled)