System ignores carrige return in text blocks in loaded CDX

[AlexeyGirin]

Steps to Reproduce

1. Click Open... button (Ctrl+O)
2. Select open from file: Text messages.pptx
   (CDX in PPTX: TextMessages.zip)
3. Select file:
4. Click Add to canvas

Actual behavior

Expected behavior

Environment details:

• Ketcher Version 2.18.0-rc.5 Build at 2024-02-09; 17:07:18
• Indigo Toolkit Version 1.18.0-rc.6+cdx.0-g99f004a82-x86_64-linux-gnu-11.4.0
• Chrome Version Version 121.0.6167.161 (Official Build) (64-bit)
• Win10
• Issue found while testing Add support for opening structures in CDX format embedded into MS PowerPoint ketcher#3914