jpg: Fix silent IPTC loss after XMP segment

[LNA-DEV]

This adds a fix for #65

For more details take a look at the issue

Tests

I tested this fix with the unit tests and a custom hugo build from the master branch. Both worked fine after the fix.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.36%. Comparing base (f2f3657) to head (22477a6).

Files with missing lines	Patch %	Lines
imagedecoder_jpg.go	71.42%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #66      +/-   ##
==========================================
- Coverage   78.41%   78.36%   -0.05%     
==========================================
  Files          16       16              
  Lines        2103     2108       +5     
==========================================
+ Hits         1649     1652       +3     
- Misses        317      318       +1     
- Partials      137      138       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.