vrend: vrend_destroy_context: fix wrong ctx

Fix not switching to corresponding context when deleting FBOs.
FBOs are not sharable between contexts.

Signed-off-by: Ka Ho Ng <khng300@gmail.com>
Reviewed-by: Elie Tournier <elie.tournier@collabora.com>

src/vrend_renderer.c

@@ -6003,6 +6003,7 @@ void vrend_destroy_context(struct vrend_context *ctx)
          glDeleteTextures(1, &ctx->pstipple_tex_id);
       ctx->pstip_inited = false;
    }
+   vrend_clicbs->make_current(ctx->sub->gl_context);
    /* reset references on framebuffers */
    vrend_set_framebuffer_state(ctx, 0, NULL, 0);