Basically, instead of updating the width of the image after clicking
`ok`, the width is adjusted live, which makes it easier to figure out
the right value for the manga being viewed.
While implementing this, I realized we can't update the backend every
time we re-render when `liveUpdate` is true, so I've updated the logic
for persisting settings to support skipping the API call to save the
settings in the backend, and only perform the API it when the user
clicks ok on the number setting.
Signed-off-by: Chance Zibolski <chance.zibolski@gmail.com>
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