fix: remove custom handling of osc tokens for ptk prompt

[jnoortheen]

https://github.com/prompt-toolkit/python-prompt-toolkit/blob/master/examples/prompts/finalterm-shell-integration.py

fixes #374

For community

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[codecov-commenter]

Codecov Report

Merging #4629 (bebb0d5) into main (c01fc6e) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #4629      +/-   ##
==========================================
- Coverage   62.93%   62.88%   -0.05%     
==========================================
  Files         133      133              
  Lines       22610    22605       -5     
  Branches     4412     4409       -3     
==========================================
- Hits        14230    14216      -14     
- Misses       7263     7274      +11     
+ Partials     1117     1115       -2     

Flag	Coverage Δ
linux	60.46% <100.00%> (-0.04%)	⬇️
macos	59.99% <100.00%> (-0.13%)	⬇️
windows	59.00% <100.00%> (+0.01%)	⬆️

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Impacted Files	Coverage Δ
xonsh/ptk_shell/shell.py	57.35% <100.00%> (+0.08%)	⬆️
xonsh/jobs.py	43.94% <0.00%> (-2.77%)	⬇️
xonsh/procs/pipelines.py	81.48% <0.00%> (-0.78%)	⬇️
xonsh/procs/posix.py	70.62% <0.00%> (-0.63%)	⬇️
xonsh/parsers/base.py	85.08% <0.00%> (+0.05%)	⬆️

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