Respect theme when loading Drawables while AppCompat is present

[jlnstrk]

Description

Makes DrawableDecoderCompat#loadDrawableV7 wrap a now passed Resources.Theme with the present Context, in order for the former to be respected as AppCompat tries to load the Drawable resource

Motivation and Context

Resolves #2783

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[jlnstrk]

Signed the CLA

[googlebot]

CLAs look good, thanks!

[sjudd]

Thanks!