Update KQS task view layouts to new specs

The small size of the screenshots and make text look odd. Implementing new UI specs to improve this.

- Updated icon position and size
- Added some blur to the thumbnail

Flag: LEGACY ENABLE_KEYBOARD_QUICK_SWITCH ENABLED
Fixes: 328259439
Fixes: 328692456
Test: opened KQS in dark and light mode
Change-Id: I2b20100ddeb562291edf5f0bacbce916002eee45