Fix more ruff lint (#139)

modules/initialize.py

@@ -4,8 +4,6 @@ import os
 import sys
 import warnings
 
-from threading import Thread
-
 from modules.timer import startup_timer
 
 

modules/shared_state.py

@@ -2,7 +2,6 @@ import datetime
 import logging
 import threading
 import time
-import traceback
 import torch
 
 from modules import errors, shared, devices
@@ -160,7 +159,7 @@ class State:
 
             self.current_image_sampling_step = self.sampling_step
 
-        except Exception as e:
+        except Exception:
             # traceback.print_exc()
             # print(e)
             # when switching models during genration, VAE would be on CPU, so creating an image will fail.