Fix diplom command to handle accented names from VUT API

Previously, the command only removed accents from user input but not from
the database name, causing comparison failures for users with accents in
their names. Now both names have accents removed before comparison.

Co-authored-by: 1ukastesar <16971100+1ukastesar@users.noreply.github.com>

Author: Copilot

cogs/absolvent/cog.py

@@ -93,8 +93,9 @@ def remove_accents(input_str):
             await inter.edit_original_response(MessagesCZ.not_in_db)
             return
 
-        name_from_db = name_from_db.name
-        if name_from_db != name_from_user_without_diacritics:
+        # remove diacritics from both names for comparison since VUT API now returns names with accents
+        name_from_db_without_diacritics = remove_accents(name_from_db.name)
+        if name_from_db_without_diacritics != name_from_user_without_diacritics:
             await inter.edit_original_response(MessagesCZ.wrong_name)
             return