Link against libncursesw instead of libncurses

A nice one-character change ;D

This simply fixes the error experienced by Omajid [here](https://github.com/Cotix/cReddit/commit/4f824b5e2e700da7f36d3144b0dc3a1ce7191149#commitcomment-4259053). When the project switched to using wchar_t with ncurses, it needed to start linking against libncursesw, the wide-character version of ncurses. Some OS's (Mine: ArchLinux), did this linking automatically for whatever reason, so I didn't experience any errors. On other OS's though (Ex. Fedora), the linking doesn't happen and linker errors appear. Linking against libncursesw fixes the issue.