SDL: Update geometry renderer example

SDL Commits
1 
From e29ebb9f18990516a2c1aedc36547b371a026b90 Mon Sep 17 00:00:00 2001
From: Christian Walter <[EMAIL REDACTED]>
Date: Sun, 9 Feb 2025 09:55:19 -0500
Subject: [PATCH] Update geometry renderer example

This PR updates the geometry renderer example such that the `color` values of `vertices[3]` are set correctly in `SDL_AppIterate`.
---
 examples/renderer/10-geometry/geometry.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/examples/renderer/10-geometry/geometry.c b/examples/renderer/10-geometry/geometry.c
index ffe71115a36d8..77ff863c3d036 100644
--- a/examples/renderer/10-geometry/geometry.c
+++ b/examples/renderer/10-geometry/geometry.c
@@ -141,7 +141,7 @@ SDL_AppResult SDL_AppIterate(void *appstate)
     /* we need one more vertex, since the two triangles can share two of them. */
     vertices[3].position.x = 600.0f;
     vertices[3].position.y = 150.0f;
-    vertices[3].color.r = vertices[0].color.g = vertices[0].color.b = vertices[0].color.a = 1.0f;
+    vertices[3].color.r = vertices[3].color.g = vertices[3].color.b = vertices[3].color.a = 1.0f;
     vertices[3].tex_coord.x = 1.0f;
     vertices[3].tex_coord.y = 1.0f;