fuzzel: refactor configure options

The current configure options exposed emulates the `choices` type of the
SVG and PNG backends from upstream meson_options with a freeform string,
however this is error prone and require accompanying validation which
unnecessarily complicates the derivation. Two alternatives were considered:

1. Splits the possible choices into separate options nad perform assertions to
   ensure only one is selected.
2. Expose a set of sane default configure options, and structure the derivation
   around this subset. Users who wish to customize the choice used can do so
   using `override` or `overrideAttrs`.

Option 1 is not sustainable for large amounts of options which require large
amount of assertions just for ensuring uniqueness of selection, and adds
complexity to the configure phase. Option 2 minimally impairs the customizablity
of the derivation and was chosen in part to address option checking[1].

[1] - https://github.com/NixOS/nixpkgs/pull/141836#discussion_r739910095

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