Fix BST parsing for latex math symbols

[Siedlerchr]

JabRef version

Latest development branch build (please note build date below)

Operating system

macOS

Details on version and operating system

mac os sonoma

Checked with the latest development build (copy version output from About dialog)

• I made a backup of my libraries before testing the latest development version.
• I have tested the latest development version and the problem persists

Steps to reproduce the behaviour

1. Preferences -> Preview -> Add BST File -> Select IEETran.bst to selected and move to top
2. Add a new entry
3. Make sure the Preview shows the IEEEtran style in the entry editor
4. See the issue with the title:

@InProceedings{Sadeghifar2014,
  author           = {Mohammad Reza Sadeghifar and J. Jacob Wikner and Oscar Gustafsson},
  booktitle        = {IEEE International Symposium on Circuits and Systemss, ISCAS 2014, Melbourne, Victoria, Australia, June 1-5, 2014},
  title            = {Linear programming design of semi-digital FIR filter and {{$\Sigma$}}{{$\Delta$}} modulator for VDSL2 transmitter},
  year             = {2014},
  month            = jun,
  pages            = {2465--2468},
  publisher        = {{IEEE}},
  bibsource        = {dblp computer science bibliography, http://dblp.org},
  biburl           = {http://dblp.uni-trier.de/rec/bib/conf/iscas/SadeghifarWG14},
  creationdate     = {2024-05-20T11:28:55},
  doi              = {10.1109/ISCAS.2014.6865672},
  modificationdate = {2024-05-20T11:36:27},
  timestamp        = {Fri, 20 May 2016 09:19:46 +0200},
  url              = {http://dx.doi.org/10.1109/ISCAS.2014.6865672},
}

Renders as:

For comparison, our custom preview renders:

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