Always specify that screenshots avoid dimming for transitions.

A screenshot may captured dimmed content even when HDR is off-screen,
for instance shortly after playback of HDR ends and the display is
taking some time to transition out of high brightness mode.

So, avoid dimming twice for those screenshot-based transitions by always
avoiding dimming.

Bug: 293560925
Test: rotation animation after HDR video plays
Test: rotation animation while HDR video plays
Change-Id: Iff541c21deb1ab483f80912c4dfd989ade6d1727