Configure external-files-path for files provider

Maybe fixes #9660. Why do Chinese companies insist on breaking things?

app/src/main/res/xml/provider_paths.xml

@@ -4,11 +4,14 @@
         name="cache_files"
         path="." />
     <external-path
-        name="ext_files"
+        name="ext"
         path="." />
     <external-cache-path
         name="ext_cache_files"
         path="." />
+    <external-files-path
+        name="ext_files"
+        path="." />
     <!--suppress AndroidElementNotAllowed -->
     <root-path
         name="ext_storage"