text: Cleaning up the cache after the rendering finishes
text: Cleaning up the cache after the rendering finishes

Before this fix, cleaning up the cache happens during making glyph
images, and this can be problematic when the text includes more
glyphs than the cache limit.

After this fix, Draw allows to have more glyph cache than the limit
temporarily.

hajimehoshi/ebiten,hajimehoshi/ebiten