fix(app): Refactor daemon initialization and add syscall import

[skrashevich]

Daemon Initialization Logic Enhanced:

• Added a new condition to check if the current process is a child (not started by init or not having a parent). This helps in determining whether to run the process as a daemon.
• Improved the check for parent process existence and status, ensuring that the daemon status is set correctly based on the parent's state.

Argument Parsing Simplification:

• Previous argument manipulation (clearing daemon flags in the argument list) has been removed.
• Simplified the way the command for re-running the program is constructed, directly using the unchanged os.Args[1:].

Fix #1165

[AlexxIT]

Strange logic near

parent, err := os.FindProcess(ppid)
if err != nil || parent.Pid < 1 {
	daemon = false
}

[AlexxIT]

Thanks! I've removed the unclear code. You can get it back in another PR if you prove its point.

[AlexxIT]

https://github.com/AlexxIT/go2rtc/releases/tag/v1.9.4