fix header line length in draft blog post

i2p2www/blog/2021/12/11/i2p-unaffected-cve-2021-44228.draft.rst

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 {% trans -%}I2P is not affected by the log4j vulnerability{%- endtrans %}
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 .. meta::
    :author: idk, zzz
@@ -8,11 +8,6 @@
    :category: security
    :excerpt: {% trans %}I2P doesn't use log4j and is therefore unaffected by CVE-2021-44228{% endtrans %}
 
-{% trans -%}
-Update details
-{%- endtrans %}
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 {% trans -%}
 I2P is not affected by the log4j 0-Day vulnerability which was published
 yesterday, CVE-2021-44228. I2P doesn't use log4j for logging, however we also