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dav1dplay: allow resizing the window

libplacebo v66 got helper functions that make preserving the aspect
ratio in this case trivial. But we still need to make sure to clear the
FBO to black if the image doesn't cover it fully.

--- a/examples/dp_renderer_placebo.c

+++ b/examples/dp_renderer_placebo.c

@@ -80,7 +80,7 @@

     placebo_renderer_create_common(int window_flags)

 {

     // Create Window

-    SDL_Window *sdlwin = dp_create_sdl_window(window_flags);

+    SDL_Window *sdlwin = dp_create_sdl_window(window_flags | SDL_WINDOW_RESIZABLE);

     if (sdlwin == NULL)

         return NULL;

@@ -326,6 +326,12 @@

         .len = 0,

     };

+#if PL_API_VER >= 66

+    pl_rect2df_aspect_copy(&target.dst_rect, &rd_priv_ctx->image.src_rect, 0.0);

+    if (pl_render_target_partial(&target))

+        pl_tex_clear(rd_priv_ctx->gpu, target.fbo, (float[4]){ 0.0 });

+#endif

+

     if (!pl_render_image(rd_priv_ctx->renderer, &rd_priv_ctx->image, &target, &render_params)) {

         fprintf(stderr, "Failed rendering frame!\n");

         pl_tex_clear(rd_priv_ctx->gpu, target.fbo, (float[4]){ 1.0 });

@@ -366,6 +372,7 @@

         .num_planes = 3,

         .width      = width,

         .height     = height,

+        .src_rect   = {0, 0, width, height},

         .repr = {

             .bits = {