vulken: VULKAN_CreateTexture returns a boolean

Fixes regression introduced by 9ff3446f036094bc005ef119e0cf07fc9b503b8e
VK_SUCCESS == 0, where success needs to return true (1).

src/render/vulkan/SDL_render_vulkan.c

@@ -2674,7 +2674,7 @@ static bool VULKAN_CreateTexture(SDL_Renderer *renderer, SDL_Texture *texture, S
             return result;
         }
     }
-    return result;
+    return true;
 }
 
 static void VULKAN_DestroyTexture(SDL_Renderer *renderer,