fdo#76658 fix bad conversion of old-style UNO service..

in my commit 0394cb37a2d378511f265004b285fd93df37e5ca
"fdo#46808, Convert ui::ImageManager to new style"

Change-Id: I77d3189723403221e7388969b1eb892a244b90af
Signed-off-by: Stephan Bergmann <sbergman@redhat.com>
(cherry picked from commit 00ddedcb477ed09b5649e816b629234d5689b861)
Reviewed-on: https://gerrit.libreoffice.org/13069
Reviewed-by: Maxim Monastirsky <momonasmon@gmail.com>
Tested-by: Maxim Monastirsky <momonasmon@gmail.com>