Fix for incorrect line number warnings when redeclaring variables

[mateosss]

Solves #42884 as #43019 did, but for master.
Does the same as the previous PR did for 3.2, but also solves it for function parameters and constants.

Before

func f(
    x,
    x
): <- Error points here
    pass

func f(x):
    const x = 1 
    pass <- Error points here

Now

func f(
    x,
    x <- Error points here
): 
    pass

func f(x):
    const x = 1 <- Error points here
    pass

Bugsquad edit:

• Fixes Wrong parse error line number (GDScript) #42884

[akien-mga]

Seems like this was fixed differently in the master branch, as the original issue is solved. Thanks for the contribution nevertheless!