remove unused import

app/main/routes.py

@@ -4,7 +4,7 @@ from os import listdir
 from pathlib import Path
 from datetime import datetime, timedelta
 
-from flask import render_template, flash, redirect, url_for, request, abort, send_file, current_app, send_from_directory
+from flask import render_template, flash, redirect, url_for, request, abort, send_file, current_app
 from flask_login import current_user, login_required
 from werkzeug.utils import secure_filename
 from werkzeug.security import safe_join