Fix glitched corner in Nickelodeon Unite.

[JMC47]

Nicktoon's Unite (also known as Spongebob and Friends Unite) has a black box over the upper left corner of the screen with Store EFB Copies to Texture Only Enabled

The game also breaks with Defer EFB Copies, so, I've disabled both.

[JMC47]

@stenzek please review

[stenzek]

Still wondering how the game is synchronizing with the GPU, if at all, but for now this seems fine. Maybe it is just a misbehaving title.

[mimimi085181]

Is it too early to talk about optimisation of Defer EFB Copies? As i understand it, in single core mode, Dolphin runs the cpu thread for x cycles and then it runs the gpu thread for y commands/cycles/whatever. Shouldn't it be safe to defer the efb copies on single core mode until just before it switches back to the cpu thread? So something like Defer EFB Copies Light for single core only.

Is there any possiblity that this issue is not a wrong read from the cpu, but a change to the graphics object before efb2ram? So the efb copy is created, efb2ram is delayed, the object is changed, and the deferred copy process is made after that change, is that a possibility?