To reproduce:
1) Open attached project and scene
2) Build and run it for Linux
3) Notice it has opened as non-full screen 1024780 window
4) Maximize it and then close it
5) Relaunch the player

Expected: It resizes back to 1024780 and non-full screen as per script setting that in Awake() (can be seen in Windows)
Actual: The window stays maximized (although the actual view sizes down to script parameters in the bottom left)

Reproduced in 2017.4.11f1, 2018.2.7f1, 2018.2.14f1, 2018.3.0b8, 2019.1.0a8