Description:
Current VCL dropdown uses a mix of styles.

Steps to Reproduce:
Open a dialog window with dropdowns for example the "general" tab of the paragraph style.

Actual Results:
There are two types of dropdown that I am aware of, the standard dropdown and the color picker dropdown. 

The standard dropdown has
...no rounded corners
...a separate button-like shape on the left
...downward pointing chevron (this matches the native style!)

The color picker dropdown is almost Windows 11 styled, however it uses...
...a downward pointing triangle (like in the win 9x days)




Expected Results:
The dropdown should...
... have round corners (4px radius, though e.g. the windows file-save dialog uses 1px radius)
... no separate button-like shape on the right
... use a downwards pointing chevron 


Reproducible: Always


User Profile Reset: No

Additional Info:
Version: 24.8.4.2 (X86_64) / LibreOffice Community
Build ID: bb3cfa12c7b1bf994ecc5649a80400d06cd71002
CPU threads: 12; OS: Windows 11 X86_64 (10.0 build 26100); UI render: Skia/Raster; VCL: win
Locale: de-DE (de_DE); UI: en-US
Calc: CL threaded