fix(filter): show input text when using --no-strict

[lucastarche]

This fixes gum filter --no-strict not showing the input string text as an option.

Before the fix:

> test
•
  examples/test.sh
  internal/stdin/stdin.go
  style/ascii_a.txt
  filter/filter_test.go

After the fix:

> test
• test
  examples/test.sh
  internal/stdin/stdin.go
  style/ascii_a.txt
  filter/filter_test.go

Related to #957, not a complete fix as I did not look into the --value flag.