fix(wifi): SVG lock icon for password-protected networks

- Replace changes-prevent-symbolic with notch/lock.svg

src/window/controlcenter/wifi.py

@@ -56,10 +56,8 @@ class WifiNetworkSlot(Box):
         # Create lock icon for secured networks
         self.lock_icon = None
         if self.access_point.requires_password:
-            self.lock_icon = Image(
-                icon_name="changes-prevent-symbolic",
-                size=12,
-                name="wifi-lock-icon",
+            self.lock_icon = svg_file(
+                "notch/lock.svg", size=12, name="wifi-lock-icon"
             )
 
         self.password_dialog = None