count help doesn't show default range type

[davidism]

Click 8 began showing help text for range types. A count option gets a default type of IntRange(min=0). If the type is IntRange but the option is count with this default type, the range help will not be shown. If a different range is used, it will still be shown.

• fixes Help text for count options has [x>=0] appended #2072

Checklist:

• Add tests that demonstrate the correct behavior of the change. Tests should fail without the change.
• Add or update relevant docs, in the docs folder and in code.
• Add an entry in CHANGES.rst summarizing the change and linking to the issue.
• Add .. versionchanged:: entries in any relevant code docs.
• Run pre-commit hooks and fix any issues.
• Run pytest and tox, no tests failed.