Build the sdui library for non-DESKTOP, too

In order to get the Impress-specific dialogs in the (new,
Online-based) iOS and Android apps, too.

Change-Id: I7400326bafc1b8a0470b5ed0fb631ae984b7b795

sd/Module_sd.mk

@@ -13,7 +13,7 @@ $(eval $(call gb_Module_add_targets,sd,\
     Library_sd \
     Library_sdd \
     Library_sdfilt \
-    $(call gb_Helper_optional,DESKTOP,Library_sdui) \
+    Library_sdui \
     Package_opengl \
     Package_web \
     Package_xml \