typefindfunctions: Increase xml typefinder closing brace limit

Merged Ilie Halip requested to merge ihalip/gstreamer:main into main

If the first XML element in a DASH manifest has its closing brance beyond the first 512 bytes (because of, e.g. lots of attributes), the MPD typefinder fails. Increase the default limit to 1024.

Fixes #2385 (closed)

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