adelielinux.xyz: ensure buffer sizes are appropriate

The default upload buffer size is 32K:

• https://github.com/solusipse/fiche/blob/4bba916e0f4a54d98a3947df7e2d0714d92a8bab/fiche.c#L208-L209

Is this appropriate for the majority of Adélie support requests?

See also:

• https://github.com/drscream/fiche/pull/1
• https://github.com/mixi/fiche/tree/musl-thread-fix