code cleanup in FilteredDeckOptins.kt and AppcompatPreferenceActivity.kt

[ialwaysbeatmywifi]

Purpose / Description

This PR addresses Android Studio IDE warnings about unnecessary wrapper class usage.

Fixes

• Fixes [Cleanup]: Fix Android Studio Warnings #13282

Approach

Replaced unnecessary Java wrapper class calls with native Kotlin methods:

1. FilteredDeckOptions.kt:

   • Changed java.lang.Boolean.toString(true) → true.toString()
   • Changed java.lang.Boolean.toString(false) → false.toString()
   • Changed java.lang.Boolean.toString(deck.getBoolean(...)) → deck.getBoolean(...).toString()

2. AppCompatPreferenceActivity.kt:

   • Simplified boolean parsing from java.lang.Boolean.parseBoolean(this.getString(key, java.lang.Boolean.toString(defValue))) to this.getString(key, defValue.toString()).toBoolean()

How Has This Been Tested?

./gradlew ktlintFormat and ./gradlew Libanki:test do the work

Learning (optional, can help others)

mentioned in the issue itself no any knowledge req

Checklist

• You have a descriptive commit message with a short title (first line, max 50 chars).
• You have commented your code, particularly in hard-to-understand areas
• You have performed a self-review of your own code
• UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• UI Changes: You have tested your change using the Google Accessibility Scanner

[ialwaysbeatmywifi]

@david-allison when time permits please approve

[david-allison]

Thanks!!!!

It's been 3 minutes, no need for a ping

[BrayanDSO]

both files are being replaced at #19669, so no need to review this

[ialwaysbeatmywifi]

thanx