### Godot version

v4.0.beta.custom_build [d1e5903c6]

### System information

Arch Linux kernel 6.1.7-arch1-1 x86_64 OpenSSH 9.1p1-3

### Issue description

When using SSH remote deploy, if the extra args field is empty (the default) the ssh command is not executed with success because a single space is inserted in place of the extra args.

```
Creating temporary directory...
Executing: ssh -p 22  davi@192.168.1.50 mktemp -d
Exit code: 255, Output: ssh: Could not resolve hostname : Name or service not known

ssh: Could not resolve hostname : Name or service not known
```

If any valid argument is passed, the command is executed successfully, in the example below I duplicated the `-p 22`, which is ignored, to show that it is not a problem of the hostname passed.

```
Executing: ssh -p 22 -p 22 davi@192.168.1.50 mktemp -d
Exit code: 0, Output: /tmp/tmp.DwFObXBL2s
```

This is infuriating for when you have non-interactive authentication configured in ssh-agent and just the hostname is needed for the connection.
This occurs for both SSH and SCP.

### Steps to reproduce

1. Enable a project to deploy with ssh
2. Fill only the hostname
3. Try to deploy
4. See the error on the console

### Minimal reproduction project

N/A
Ref<FileAccess> fb = FileAccess::open(p_path, FileAccess::READ);
	ERR_FAIL_COND_V_MSG(fb.is_null(), false, vformat("Can't open file: \"%s\".", p_path));
	uint32_t magic = fb->get_32();
	return (magic == 0x464c457f);
}
bool EditorExportPlatformLinuxBSD::is_shebang(const String &p_path) const {
	Ref<FileAccess> fb = FileAccess::open(p_path, FileAccess::READ);
	ERR_FAIL_COND_V_MSG(fb.is_null(), false, vformat("Can't open file: \"%s\".", p_path));
	uint16_t magic = fb->get_16();
	return (magic == 0x2123);
}
bool EditorExportPlatformLinuxBSD::is_executable(const String &p_path) const {
	return is_elf(p_path) || is_shebang(p_path);
}
Error EditorExportPlatformLinuxBSD::fixup_embedded_pck(const String &p_path, int64_t p_embedded_start, int64_t p_embedded_size) {