Remove comparison of distinct types

[camelpunch]

Elixir 1.18.x complains about the comparison of these operands:

warning: comparison between distinct types found:

        first != 47

    given types:

        binary() != integer()

    where "first" was given the type:

        # type: binary()
        # from: lib/ex_image_info/types/webp.ex:29:61
        <<..., first::binary-size(1), ...>>

    While Elixir can compare across all types, you are comparing across types which are always disjoint, and the result is either always true or always false

    typing violation found at:
    │
 35 │       lossy == " " and first != 0x2F -> parse_lossy(first, next)
    │                              ~
    │
    └─ lib/ex_image_info/types/webp.ex:35:30: ExImageInfo.Types.WEBP.info/1