fix(fabric.Text): underline color with text style ( regression from textpath )

[asturur]

In refactoring code for textPath a line was butchered.
We need a visual test for this bug, or is not a real fix.

close #6965
close #6818
close #6970

[github-actions]

Code Coverage Summary

> fabric@4.3.1 coverage:report /home/runner/work/fabric.js/fabric.js
> nyc report --reporter=lcov --reporter=text

-----------|---------|----------|---------|---------|-----------------------------------------------
File       | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s                             
-----------|---------|----------|---------|---------|-----------------------------------------------
All files  |   82.69 |    76.92 |    85.6 |   82.45 |                                               
 fabric.js |   82.69 |    76.92 |    85.6 |   82.45 | ...,29597,29722,29802-29867,29990,30089,30306 
-----------|---------|----------|---------|---------|-----------------------------------------------

[github-actions]

Code Coverage Summary

> fabric@4.3.1 coverage:report /home/runner/work/fabric.js/fabric.js
> nyc report --reporter=lcov --reporter=text

-----------|---------|----------|---------|---------|-----------------------------------------------
File       | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s                             
-----------|---------|----------|---------|---------|-----------------------------------------------
All files  |   82.69 |     76.9 |    85.6 |   82.45 |                                               
 fabric.js |   82.69 |     76.9 |    85.6 |   82.45 | ...,29597,29722,29802-29867,29990,30089,30306 
-----------|---------|----------|---------|---------|-----------------------------------------------

[zhenyakovalyov]

@asturur heya, could you please advise on when you are planning to release this bit?

[asturur]

i can release it later today, i wanted to add some things but i do not have time

[zhenyakovalyov]

that is much appreciated!