fix aria2 process killing completely (cross-platform)

core/utils/general/shutdown.py

@@ -1,14 +1,27 @@
 from core.utils.data.state import state
 import threading
+import psutil
+import sys
 
 
 shutdown_event = threading.Event()
 
 def kill_aria2server():
+    if sys.platform.startswith("win"):
+        process = "aria2c.exe"
+    else:
+        process = "aria2c"
+
     if state.aria2process:
         state.aria2process.kill()
         if state.debug:
-            print("\nKilled Aria2")
+            print("Killed Aria2")
+
+    for proc in psutil.process_iter():
+        if proc.name() == process:
+            proc.kill()
+            if state.debug:
+                print("Killed Aria2c")
 
 
 def closehelper():