Change vector setup check to use non-themed drawable

Since we will soon have a public API for getDrawable(),
we should make sure that our setup check works when the
theme doesn't contain AppCompat attributes.

Previously we were using the back icon, which references
AppCompat theme attrs.

BUG: 30361033
Change-Id: I8eb215293cdf6dc7832a503ffd1b0040c557e141
2 files changed