Description:
When you create 3 slide in Impress and give them a text which ones contain an internal hyperlink and save pptx.
So when you reload the pptx file, the texts of internal hyperlinks are black not blue like links. 

Steps to Reproduce:
1.Create a new presentation
2.Add two new slides
3.Add to the three slides a text. 
4.Appoint the text -> CTRL + K 
5.Choose "Document" on the sidebar of the window -> click the icon at the end of the "Target in Document" option
6.Choose a Slide from the list -> Apply -> close the "Target in Document" window -> Apply and Ok to the Hyperlink window
7.Create a new text internal Hyperlink on the second and third slide -> steps to creation are in the "Steps to Reproduce" list from 3. step to 7. step
8.Save as pptx

Actual Results:
Hyperlinks works, but color of texts are black.

Expected Results:
When we open the saved pptx file again, the color of texts with internal hyperlinks should be blue like links.


Reproducible: Always


User Profile Reset: No



Additional Info:
Version: 7.5.0.0.alpha0+ (x64) / LibreOffice Community
Build ID: 415dc3bb1c03dbdbc3cbca274bc435ac7557ba2d
CPU threads: 8; OS: Windows 10.0 Build 19042; UI render: Skia/Vulkan; VCL: win
Locale: hu-HU (hu_HU); UI: en-US
Calc: CL