VULKAN: Fix SDR font pipeline topology (fixes HDR font artifacts)

The SDR font pipeline introduced in 8fa8418 was created with
VK_PRIMITIVE_TOPOLOGY_TRIANGLE_STRIP instead of TRIANGLE_LIST.

The font and alpha_blend pipelines require TRIANGLE_LIST
topology for indexed quad rendering (indices [0,1,2,2,1,3] per
quad).  The initial topology is set to TRIANGLE_LIST at line
3321, and the original font pipeline at line 3451 inherits it
correctly.

However, the SDR pipeline creation block runs after the menu
shader loop (lines 3514-3646), which sets input_assembly.topology
to TRIANGLE_STRIP in its last iteration (i=11, topology = i&1 =
STRIP).  The SDR font pipeline at line 3678 inherited this stale
STRIP topology.

With TRIANGLE_STRIP, the indexed [0,1,2,2,1,3] pattern produces
degenerate triangles and incorrect winding, causing subtle glyph
positioning artifacts visible as ~1px character shifts in the
Ozone menu under Vulkan HDR.  The effect was most noticeable on
characters with vertical strokes ('l', 'n', 'd') and punctuation.

Fix: reset input_assembly.topology to VK_PRIMITIVE_TOPOLOGY_
TRIANGLE_LIST before creating the SDR font and alpha_blend
pipelines.

Only affects HDR builds with VK_CTX_FLAG_HDR_SUPPORT set.
Non-HDR path is unchanged.

Author: LibretroAdmin

gfx/drivers/vulkan.c

@@ -3656,6 +3656,11 @@ static void vulkan_init_pipelines(vk_t *vk)
    {
       pipe.renderPass = vk->sdr_render_pass;
 
+      /* Reset topology to TRIANGLE_LIST for the font and
+       * alpha_blend pipelines.  The preceding menu shader loop
+       * leaves it at TRIANGLE_STRIP. */
+      input_assembly.topology = VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST;
+
       /* SDR font pipeline */
       module_info.codeSize   = sizeof(alpha_blend_vert);
       module_info.pCode      = alpha_blend_vert;