fix: Append EOF instead of newline

[radeksimko]

Fixes #238

The HCL parser apparently isn't fully ready to parse isolated blocks terminated by newline and so we just append EOF instead of newline, which the parser can safely deal with.

This technically fixes the bug in the sense that CPU no longer spikes, but the completion context is a bit off, so that still needs fixing:

resource "aws_ecr_lifecycle_policy" "policy" {
  for_each = toset(var.repo_name
# here -------------------------^
}

config_block.go:112: completing block: "repo_name", &hcl.Range{Filename:"main.tf", Start:hcl.Pos{Line:2, Column:24, Byte:70}, End:hcl.Pos{Line:2, Column:33, Byte:79}}

Technically we don't support RHS completion yet anyway, so there should be no context being matched, or something, but certainly not variable name being treated as block name/type.

[ghost]

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