Revert "dock/desktop:: read specific icon for goverment version."

This reverts commit ed444bd09c93ca04a7a48a7823f86f7225d504ad.

keep reading trash icons from icon theme.

tower:https://tower.im/projects/8f19f0bf0e754f0b82ef2c24bc230973/todos/e95ad265026843e5a8ff7d840a9c7816/

Change-Id: Ieb470016732338b23ec00d16b1e40ffb238fe4e9