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Description of the Issue

The Style Configurator does not save changes that are made if "User-defined keywords" which are set at the previous time are removed completely.

Steps To Reproduce

1. Open Style Configurator
2. Go to C++ --> TYPE WORD
3. Edit the "User-defined keywords" section by modifying the current content to / or adding RELIGION
4. Click "Save & Close" button
5. Re-open Style Configurator
6. Go to C++ --> TYPE WORD
7. Remove RELIGION from "User-defined keywords" section
8. Click "Save & Close" button
9. Re-open Style Configurator
10. Go to C++ --> TYPE WORD
11. Check the "User-defined keywords" section

Current Behavior

RELIGION is still there.

Expected Behavior

RELIGION should be removed permanently.

Debug Information

Notepad++ v8.6.9   (64-bit)
Build time : Jul 12 2024 - 05:09:25
Path : C:\Program Files\Notepad++\notepad++.exe
Command Line : 
Admin mode : OFF
Local Conf mode : OFF
Cloud Config : OFF
Periodic Backup : ON
OS Name : Windows 11 Home (64-bit)
OS Version : 23H2
OS Build : 22631.3958
Current ANSI codepage : 1252
Plugins : 
    mimeTools (3.1)
    NppConverter (4.6)
    NppExport (0.4)

Anything else?

Related issue: #14303