tools/player: fix empty text in some update scenario
tools/player: fix empty text in some update scenario

On scene change with the exact same scene and configuration, the
original scene gets reset along with the info/seek bar. But since
text_last_frame_index is identical to the previous state, the text won't
be reprinted again unless forced.

gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl