fix: compile command logic when using `id-as` ice

[vladdoster]

Description

Fixes issue where plugins using id-as ice would not not be correctly handled when running zinit compile --all. Compiling a single plugin worked, but the logic for compiling all plugins was broken.

Additionally, this cleans up the log message logic to reflect what is actually done.

Related Issue(s)

Motivation and Context

Usage examples

How Has This Been Tested?

Types of changes

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

Checklist:

• [X] All new and existing tests passed.
• [ ] I have added tests to cover my changes.
• [ ] I have updated the documentation accordingly.