Revert "make default values typed in proc AST same as param sym AST" (#24191)

Reverts #24184, reopens #12942, reopens #19118

#24184 seems to have caused a regression in
https://github.com/c-blake/thes and
https://github.com/c-blake/bu/blob/main/rp.nim#L84 reproducible with
`git clone https://github.com/c-blake/cligen; git clone
https://github.com/c-blake/thes; cd thes; nim c -p=../cligen thes`.
Changing the `const` to `let` makes it compile.

A minimization that is probably the same issue is:

```nim
const a: seq[string] = @[]

proc foo(x = a) =
  echo typeof(x)
  echo x

import macros

macro resemFoo() =
  result = getImpl(bindSym"foo")

block:
  resemFoo() # Error: cannot infer the type of parameter 'x'
```

This should be a regression test in a future reimplementation of #24184.

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