fix(android): resolve compilation error in TV feature detection

Update the Android TV feature check to use the instance-based
`packageManager` instead of the static `PackageManager` class.
This ensures the `hasSystemFeature` method is called correctly on
the available context instance.

app/src/main/java/com/michatec/radio/MainActivity.kt

@@ -37,7 +37,7 @@ class MainActivity : AppCompatActivity() {
 
     // Check if the device running the app is an Android TV instance
     private val isAndroidTV: Boolean by lazy {
-        PackageManager.hasSystemFeature(PackageManager.FEATURE_LEANBACK)
+        packageManager.hasSystemFeature(PackageManager.FEATURE_LEANBACK)
     }
 
     // request notification permission (for Android 13+)

app/src/main/java/com/michatec/radio/SettingsFragment.kt

@@ -42,7 +42,7 @@ class SettingsFragment : PreferenceFragmentCompat(), YesNoDialog.YesNoDialogList
 
     // Check if the device running the app is an Android TV instance
     private val isAndroidTV: Boolean by lazy {
-        PackageManager.hasSystemFeature(PackageManager.FEATURE_LEANBACK)
+        context?.packageManager?.hasSystemFeature(PackageManager.FEATURE_LEANBACK) == true
     }
 
     /* Overrides onViewCreated from PreferenceFragmentCompat */