Fix: Allow device to sleep (#1125)

Updated project.godot to set window/energy_saving/keep_screen_on to false (by default is true)

Author: msemelman

project.godot

@@ -54,6 +54,7 @@ gdscript/warnings/narrowing_conversion=false
 
 window/size/viewport_width=1280
 window/size/viewport_height=720
+window/energy_saving/keep_screen_on=false
 window/per_pixel_transparency/allowed.android=false
 window/per_pixel_transparency/allowed.web=false