Generalize `Φ-dispatch` to rewrite `Φ` instead of `Φ.a`

[eyihluyc]

In the discussion of rules, instead of rewriting Φ.a, Yegor suggests to rewrite Φ. See https://github.com/yegor256/phi-paper/pull/32.

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PR-Codex overview

This PR updates the yegor.yaml file in the eo-phi-normalizer module to change the global_object value and simplify the pattern and result values.

Detailed summary

• Updated global_object value to '!b'
• Simplified pattern from Φ.!a to Φ
• Simplified result from !obj to !b
• Removed apply_in_subformations from when block

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