fix(shim): Avoid unexpected output of list subcommand

[lewis-yeung]

Description

Related: #5568. See my comment.

The usage of scoop shim list should be more explicit: scoop shim list [<shim_name>/<regex_pattern>...], since regular expression matching is used in this case.

Motivation and Context

Closes #5568.

How Has This Been Tested?

Run:

scoop shim list scoo*

Output:

Name       Source   Alternatives IsGlobal IsHidden
----       ------   ------------ -------- --------
scoop-slim External              False    False
scoop      scoop                 False    False

Checklist:

• I have read the Contributing Guide.
• I have ensured that I am targeting the develop branch.
• I have updated the documentation accordingly.
• I have updated the tests accordingly.
• I have added an entry in the CHANGELOG.