Shell: disabling "Show window title" option doesn't work as expected?

[VariabileAleatoria]

Distribution (run cat /etc/os-release):
```
NAME="Ubuntu"
VERSION="20.04 LTS (Focal Fossa)"

**Related Application and/or Package Version (run `apt policy pop-shell` or provide the latest commit if building locally):**

pop-os shell commit: 9e8ab29cb976b078aa6e8fab59b09527a092a1b8
```

Issue/Bug Description:
With "Show window title" option turned off there are few programs that actually remove title bar (Telegram and Discord) while Spotify isn't affected by the option.
VSCode instead as an annoying behaviour, the option works but it has to be turned on and off every time, or after boot it will show the title bar even if the option is OFF.

[mmstick]

Feature is hidden because of this issue. It will be a toggle in the panel menu when it's ready

[jmmaranan]

Related to #378

[VariabileAleatoria]

to me this fixed only urxvt which now doesn't show titlebars, but other programs (spotify, vscode) still do