img_open: explicitly decode image data immediately (#380)

the way `imlib_load_image()` works, is that it only does a lightweight
signature/metadata check. it doesn't actually decode the image. which
means that a file that has valid metadata but invalid content would get
loaded successfully.

`imlib_image_get_data_for_reading_only()` basically forces imlib to
decode the data, and thus reveal any malformed images so we can reject
it (see commit f0266187).

however, this is a spurious way of achieving the goal at hand. imlib2
already offers an `_immediately` variant which decodes the data
immediately. so just use that instead of spuriously using the "get_data"
function to force a decode.

Reviewed-on: https://codeberg.org/nsxiv/nsxiv/pulls/380
Reviewed-by: Berke Kocaoğlu <berke.kocaoglu@metu.edu.tr>

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