Previews: Filename does not respect query string delimiter (`?`)

[gonX]

For example, the link https://github.com/OpenTabletDriver/OpenTabletDriver/blob/ecc888716fc18329749f7b7d278f2b3b5749ff21/README.md?plain=1#L116 results in:

The expected result is that it doesn't contain this line:

The issue primarily stems from the fact that Discord will reject invalid languages for codeblocks (e.g. if it contains invalid characters) and instead emit the full string.