Typo in capitalization of include file name

Change-Id: I41a46c5b62c06f6298fc6e0ac70ff508bf27ec29
(cherry picked from commit 2732615c63d310232ac1900ca7549df653f792ff)
Reviewed-on: https://gerrit.libreoffice.org/6756
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
Tested-by: Stephan Bergmann <sbergman@redhat.com>