Add cliff shadows: template_quests – NO_EDIT

[russell-cj]

Apply the visual shadow improvement to the NO_EDIT scenes that include cliff structures.

Scenes to modify

• res://scenes/quests/template_quests/NO_EDIT/1_NO_EDIT_stealth/NO_EDIT_stealth.tscn
• res://scenes/quests/template_quests/NO_EDIT/2_NO_EDIT_combat/NO_EDIT_combat.tscn