[CurseForge Generic] server.properties overwrite should set "server-ip" to "" instead of "0.0.0.0" to support IPv6

[NightV402]

Egg: CurseForge Generic
File: minecraft/java/curseforge/egg-curse-forge-generic.json

Issue Description:
The current configuration file:

{
    "server.properties": {
        "parser": "properties",
        "find": {
            "server-ip": "0.0.0.0",
            "server-port": "{{server.allocations.default.port}}",
            "query.port": "{{server.allocations.default.port}}"
        }
    }
}

How it should look:

{
    "server.properties": {
        "parser": "properties",
        "find": {
            "server-ip": "",
            "server-port": "{{server.allocations.default.port}}",
            "query.port": "{{server.allocations.default.port}}"
        }
    }
}

Setting the server-ip to 0.0.0.0 tells the server to listen to IPv4 exclusively, completely ignoring any IPv6 connections. Since this configuration is applied on every start automatically, it isn't even possible to manually change this in the server.properties file.