Clear color handling for LE_X1A7R8G8B8_O1A7R8G8B8 and LE_X1A7R8G8B8_Z1A7R8G8B8 needs testing/assert removal

[abaire]

Bug Description

We need to remove the unconditional assert here:

xemu/hw/xbox/nv2a/pgraph/pgraph.c

Line 3080 in c678433

assert(false); /* Untested */

Expected Behavior

You should be able to clear the screen with the framebuffer surface format set to any HW supported format.

Tests: abaire/nxdk_pgraph_tests@76eec60
HW Test results: https://abaire.github.io/nxdk_pgraph_tests_golden_results/results/Clear/index.html - note that alpha is significant for these tests.

xemu Version

N/A, affects all versions

System Information

N/A, affects all systems

Additional Context

No response

[abaire]

Please also uncomment the tests here: https://github.com/abaire/nxdk_pgraph_tests/blob/c64f5af5f7c3a890f1a00a927c6b72c2656ea025/src/tests/pvideo_tests.cpp#L783