Reduce Lockscreen Smartspace start padding to 16dp, same as end padding.

The non-RemoteViews cards, as well as the page indicator, will have
internal padding added, so that the total padding remains 32dp for them.

Also applied ktfmt fixes: diff patch 2 vs 1.

Flag: EXEMPT bugfix
Bug: 382345130
Test: on device, trigger multiple Smartspace cards including Sports
Test: on device, check wallpaper preview is not changed
Change-Id: Ifd2dbe73889ce14e99e3d76630cf1b100bb4b8a9