media: Fix memory leak

media: Fix memory leak

This fixes the following memory leak as a result of not freeing
app->proxies:

160 (32 direct, 128 indirect) bytes in 1 blocks are definitely lost in
loss record 218 of 261
   at 0x484086F: malloc (vg_replace_malloc.c:381)
   by 0x1CF80E: btd_malloc (util.c:33)
   by 0x1CF24D: queue_new (queue.c:47)
   by 0x144DB9: create_app (media.c:2262)
   by 0x144DB9: register_app (media.c:2322)
   by 0x1CC148: process_message (object.c:246)

Signed-off-by: Anuj Jain <anuj01.jain@samsung.com>
Signed-off-by: Ayush Garg <ayush.garg@samsung.com>