Handle secondary GPU reset

On a multi-gpu setup, a reset of the secondary GPU was detected
but not properly handled. This fixes that by recreating the mgpu renderer.

render/gles2/pass.c

@@ -255,6 +255,7 @@ struct wlr_gles2_render_pass *begin_gles2_buffer_pass(struct wlr_gles2_buffer *b
 		GLenum status = renderer->procs.glGetGraphicsResetStatusKHR();
 		if (status != GL_NO_ERROR) {
 			wlr_log(WLR_ERROR, "GPU reset (%s)", reset_status_str(status));
+			renderer->wlr_renderer.lost = true;
 			wl_signal_emit_mutable(&renderer->wlr_renderer.events.lost, NULL);
 			return NULL;
 		}