Fix Control bar icon size isn't applied when opening a new window

Fixed isuue #5920 (closed)

issue:

• When a new window is opened, "Preferences > Interface > Toolbars > Control bar icon size" settings wouldn't get applied automatically.
• And icons would be of default size(16px).

fixes:

• Added apply_ctrlbar_settings(); at the end of SPDesktopWidget() so the previously saved settings get applied after the creation of the toolbar section in the application.

Sample Video:

Screencast_from_2025-10-10_13-36-29