[File] Regression: OpenStreetMap XML data

[Christoph Biedl]

Hello,

commit 26ab7dd6b61008d65d33fd161a1a14b12b71ff7a
Author: Christos Zoulas <christos at zoulas.com>
Date:   Tue Aug 27 19:17:10 2024 +0000

    more duplicate deleting/merging

unfortunately broken the detection of Openstreetmap files, at least
for the sample in my collection:

-OpenStreetMap XML data
+XML 1.0 document, Unicode text, UTF-8 text

Sample attached, honestly I don't know where I got that from.

    Christoph
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<?xml version="1.0" encoding="UTF-8"?>
<osm version="0.6" generator="CGImap 0.0.2">
</osm>