Simplify SettingsIntelligence proguard rules

These rules are redundant with global build rules, so remove them.
This is effectively a no-op. A follow-up change will further streamline
rules that are unnecessary but produce a modified APK.

Bug: 248580093
Test: m SettingsIntelligence + confirm identical
Change-Id: I15c0b5b9a751841e8fe862023b0ed9f683fe03de