Settings: Make find fingerprint look great again

* The current logic places the animation based on the size of
  the whole overlay instead of the image, which is a fixed-size
  png
* Get the size of the image instead and place the dot relative
  to it
* Also use "wrap_content" and add a padding to the top so the
  distance to the text is a fixed thing, not depending on how
  much space relative to the wanted space it actually takes

* Preview: https://imgur.com/a/XanJ2aP

Change-Id: I2bd08cee1abd1c6bad78ca1efc2189e573ded3cc