Remove cleanup requirement for storage permission

We're able to write directly to the Downloads folder (tested on API 33) so there's no reason to check for storage permission when trying to cleanup, we instead just check if we can actually write to that directory and if not we don't cleanup.

This is related to #2415

leakcanary-android-core/src/main/java/leakcanary/internal/LeakDirectoryProvider.kt

@@ -44,8 +44,9 @@ internal class LeakDirectoryProvider constructor(
   private val context: Context = context.applicationContext
 
   fun listFiles(filter: FilenameFilter): MutableList<File> {
-    if (!hasStoragePermission() && requestExternalStoragePermission()) {
-      requestWritePermissionNotification()
+    val externalStorageDirectory = externalStorageDirectory()
+    if (!externalStorageDirectory.exists() || !externalStorageDirectory.canWrite()) {
+      return mutableListOf()
     }
     val files = ArrayList<File>()