Optimize paths for all apps search drawables.

The search icon has been split into two much shorter paths than the
previous single path. Additionally, the xml file size has decreased.

Test: Manual
Bug: 265170176
Flag: ENABLE_ALL_APPS_SEARCH_IN_TASKBAR
Change-Id: I3dcd0f5c978e2c3d249ec01f34b7346657da6bb6