fix db query that was fetching twice the same item

Author: RobinDavid

src/bindiff/file.py

@@ -168,9 +168,11 @@ def _load_file(self, cursor: sqlite3.Cursor) -> None:
 
         :param cursor: sqlite3 cursor to the DB
         """
-        query = "SELECT * FROM file"
-        self.primary_file = File(*cursor.execute(query).fetchone())
-        self.secondary_file = File(*cursor.execute(query).fetchone())
+        files = cursor.execute("SELECT * FROM file").fetchall()
+        assert len(files) >= 2
+
+        self.primary_file = File(*files[0])
+        self.secondary_file = File(*files[1])
 
     def _load_metadata(self, cursor: sqlite3.Cursor) -> None:
         """