Fix encoding of common loc lss file

[carlossanlop]

@cristianosuzuki77 @ViktorHofer @ericstj

This file was last flowed into dotnet/runtime by the dependency bot as a binary file. dotnet/runtime#90014

The file should be treated as plain text / xml.

The GitHub diff still thinks this extension is a binary file, but if you click on View File, it now looks like a plain text xml file, instead of showing monospaced characters to indicate it's binary. See before: https://github.com/dotnet/runtime/blob/a29a13b27ce9ee16b7dac4edede4994c433200ce/eng/common/loc/P22DotNetHtmlLocalization.lss

[ViktorHofer]

Should we mark .lss files as plain text in this repo's .gitattributes file?

[carlossanlop]

Should we mark .lss files as plain text in this repo's .gitattributes file?

Levi just mentioned the same to me. I'll fix that too.

[carlossanlop]

@ViktorHofer Does that mean we need to make the same .gitattributes modification to all repos that inherit from arcade, or is that file also going to be flowed with dependency flow PRs?

[ViktorHofer]

@ViktorHofer Does that mean we need to make the same .gitattributes modification to all repos that inherit from arcade, or is that file also going to be flowed with dependency flow PRs?

Ideally in all repos as the file doesn't flow into consuming repos. It's on a per repository basis. I think just having it in arcade and runtime for now should be sufficient. The origin (where it is originally checked in) is the most important place.