Description:
General LibreOffice shortcuts should be visible even if you select any module on Keyboard tab in Customize dialog


Steps to Reproduce:
1. Open Writer
2. Open Customize dialog using Tools menu
3. Select Keyboard tab
4. Make sure you have selected Writer radio button in top right corner
5. Click inside Keyboard area and press Ctrl+Alt+4 shortcut 
6. You see the shortcut is free (it did not assign to any command)
7. But if you select LibreOffice radio button in top right corner, click in Keyboard area again, and press Ctrl+Alt+4 shortcut, then you'll see that shortcut is using! It using just in all modules for Sidebar's Navigator opening!

So I suggest to show all using shortcuts in Keyboard area regardless of selected the radio buttons.

It may be for example just have grey font color, as it's for some predefined system shortcuts like Ctrl+F4.
So after this change user can see all used shortcuts in modules include LibreOffice general when they look at only Writer or only Calc shortcuts.

Actual Results:
Users don't see assigned LibreOffice general shortcuts when they look at only Writer/Calc/etc. shortcuts in Customize dialog

Expected Results:
Users should see assigned LibreOffice general shortcuts when they look at only Writer/Calc/etc. shortcuts in Customize dialog


Reproducible: Always


User Profile Reset: No



Additional Info:
Version: 7.5.0.0.alpha0+ (x64) / LibreOffice Community
Build ID: bfca51d9035000e518e4938ceb145cb92cc17b1f
CPU threads: 8; OS: Windows 10.0 Build 19043; UI render: Skia/Raster; VCL: win
Locale: ru-RU (ru_RU); UI: ru-RU
Calc: threaded