Rename noChildren to hasChildren for clarity

[gioalex07]

The property noChildren returned true when children were present, which was semantically misleading. Renamed to hasChildren to match the actual behavior and avoid confusion for future contributors.

Summary

• Rename WiFiDetail.noChildren to hasChildren for semantic clarity.
• The property name was misleading: noChildren returned true when children were present.

What does this implement/fix?

• Renamed property in WiFiDetail.kt
• Updated consumer in AccessPointsAdapterGroup.kt (2 call sites)
• Updated test names and assertions in WiFiDetailTest.kt and AccessPointsAdapterGroupTest.kt

Does this close any issues?

• N/A (naming/clarity improvement)

How was this tested?

• Platform: WSL2 / AlmaLinux 9
• Build variant: debug
• Commands run:

./gradlew ktlintCheck     → BUILD SUCCESSFUL
./gradlew testDebugUnitTest → BUILD SUCCESSFUL