Fix clipping quirk

[guilherme-puida]

The test rom describes the following behavior:

Clipping - Sprites drawn at the bottom edge of the screen get clipped instead of wrapping around to the top of the screen. When clipping is off, the test checks if sprites get rendered at the right coordinates on the other side of the screen. This also tests that sprites drawn at coordinates of x > 63 and/or y > 31 wrap around to x % 64 and y % 32. More information here. Test will show ERR1 if the clipping is inconsistent in different dimensions or wrapping to the wrong coordinates and ERR2 if sprites don't wrap around as expected.

Right now, the emulator outputs clipping off x, when it should be clipping on ✓.