Configuration generated with inconsistent and non-OS compliant line endings

## Overview

Running under Linux (and potentially Windows as well), when Link creates a `.linkconfig` file, MacOS line endings (`⎕UCS 13`) are used, which causes spurious interaction with other Linux tools, _e.g._

```
$ cat ws/.linkconfig
} },watch: "dir",ID: "4.0.17"},

In fact, however, the final byte is `⎕UCS 10`.
```

Link does respects `⎕UCS 10` line endings just fine at read time, so it might be desirable to also use OS-specific line endings at generation as well.

## Reproduction

```
]LINK.Create # nonexistent -watch=dir
Linked: # ← /home/x/devel/com.wilsonb.git/scratchpad/bmp/nonexistent [directory was created]

⎕UCS d←⎕NREAD('nonexistent/.linkconfig'⎕NTIE 0) 83 ¯1
{
LinkVersion: { ID: "4.0.17"},

Settings: {
watch: "dir",
},
}

10 13⍳d
2 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 1 1 2 2 2 2 2 2 2 2 2 2 2 2 2 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 1 2 2 2 2 1 2 0

```

Note also the trailing `⎕UCS 10` byte.

## Version Information

```
]version
Dyalog 19.0.50027 64-bit Unicode, BuildID 3dae0625
OS Linux 6.13.12 #1 SMP PREEMPT_DYNAMIC 1 x86_64
Link 4.0.17
SALT 2.915
UCMD 2.6
.NET .NET 8.0.8
WS 19.0
Tatin (unavailable)
Cider (unavailable)
```