fix(syncforreddit/change-oauth-client-id): use downloads directory

This fixes permission errors on Android

src/main/kotlin/app/revanced/patches/syncforreddit/api/patch/ChangeOAuthClientIdPatch.kt

@@ -34,7 +34,10 @@ class ChangeOAuthClientIdPatch : BytecodePatch(
                 return PatchResultError("No client ID provided")
             }
 
-            File(Environment.getExternalStorageDirectory(), "reddit_client_id_revanced.txt").also {
+            File(
+                Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS),
+                "reddit_client_id_revanced.txt"
+            ).also {
                 if (it.exists()) return@also
 
                 val error = """