[3.2] Quickfix for misleading editor message when redeclaring variables

[mateosss]

Solves #42884.
Before:

func f():
    var x
    ...
    var x
    pass <- Redeclaration of x

Now:

func f():
    var x
    ...
    var x <- Redeclaration of x
    pass 

A similar problem is present in master, however there was a rewrite of the parser in there, and this seemed like an easy enough change to be worth doing.

[akien-mga]

Thanks!