changelog: revert the default back to /srv/tftp (LP: #1855490)

Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>

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# Date:      Mon Dec 9 16:04:13 2019 +0100
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# interactive rebase in progress; onto 48416f8
# Last commands done (2 commands done):
#    pick 7aac5c6 Revert "debian/tftpd-hpa.templates: Set /var/lib/tftpboot by default instead of /srv/tftp."
#    reword 02110bf changelog: evert the default back to /srv/tftp (LP: #1855490)
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# Changes to be committed:
#	modified:   debian/changelog
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