Exporter: fix order for Readwise (#10824)

Exported highlights are good sorted by position, page numbers could be wrong.
Closes #10817.

For reference: https://readwise.io/api_deets

plugins/exporter.koplugin/target/readwise.lua

@@ -106,7 +106,7 @@ function ReadwiseExporter:createHighlights(booknotes)
                 category = "books",
                 note = clipping.note,
                 location = clipping.page,
-                location_type = "page",
+                location_type = "order",
                 highlighted_at = os.date("!%Y-%m-%dT%TZ", clipping.time),
             }
             table.insert(highlights, highlight)