revert changes in dbc.py

Author: SabrineBH

src/canmatrix/formats/dbc.py

@@ -637,11 +637,12 @@ def add_frame_by_id(new_frame):  # type: (canmatrix.Frame) -> None
                     if is_complex_multiplexed or is_multiplexer:
                         temp_signal.is_multiplexer = True
                         temp_signal.multiplex = 'Multiplexor'
-                        
+
                     if not temp_signal.is_little_endian:
                         # startbit of motorola coded signals are MSB in dbc
                         temp_signal.set_startbit(int(temp.group(3)), bitNumbering=1)
                     frame.add_signal(temp_signal)
+
                     if is_complex_multiplexed:
                         frame.is_complex_multiplexed = True