fix(gpu): drop colorWriteEnable dynamic state on depth-only pipelines
Pipelines were created with VK_DYNAMIC_STATE_COLOR_WRITE_ENABLE_EXT
unconditionally on non-Apple platforms, but the draw path only calls
vkCmdSetColorWriteEnableEXT when there is at least one color attachment.
A depth-only draw therefore reached vkCmdDrawIndexed with the dynamic
state declared and never set, which violates
VUID-vkCmdDrawIndexed-None-07749.
With validation enabled the error is fatal, so any title that issues a
depth-only pass aborts. The launcher enables validation by default
(vulkan_validation_enabled = true), so this is the default configuration:
PAC-MAN WORLD Re-PAC crashes from the launcher while the same build runs
normally with --vulkan-validation false.
Gate the declaration on the same color_count the draw path uses. Both
sides read state.color_count from the same draw, so the two conditions
are now identical by construction.
nmzik