lua http: mobile.css wasn't packaged.

Please BP.
Bug introduced by af04c6fac8c2c6eedfcb7cc54e4fd4171d9a7437
(cherry picked from commit 1db29c8b609182c7dff28b9374bc0b4d436e7965)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

share/Makefile.am

@@ -376,6 +376,7 @@ DIST_http_lua = \
 	lua/http/css/ui-lightness/images/ui-icons_ef8c08_256x240.png \
 	lua/http/css/ui-lightness/images/ui-bg_glass_100_fdf5ce_1x400.png \
 	lua/http/css/main.css \
+	lua/http/css/mobile.css \
 	lua/http/js/jquery-1.5.1.min.js \
 	lua/http/old/js/functions.js \
 	lua/http/old/js/vlm.js \