Remove %BIN_DIR fake plugin entry from `zinit times` output.

[psprint]

Description

The fake %$ZINIT[BIN_DIR] plugin shouldn't be shown in zinit times output.

Motivation and Context

The fake null plugin is used to autoload a function from BIN_DIR zinit directory, it shouldn't be listed.

Related Issue(s)

#426

How Has This Been Tested?

It is a straightforward change, however I've tested it via zinit times and everything was OK.

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[psprint]

@vladdoster: I've renamed the commit adding "fix:" prefix.

[psprint]

Is anything wrong with PR? It's quite important to get this active as the fake absolute path plugin may be confusing users and is not nice to leave there dangling…