fix: don't use stale zoom values and reduce redundancy

[Samillion]

Changes:

• Fix stale zoom values, each zoom event should call the video-zoom property directly
• Remove unused playtime_nohour_force_init state
• Reduce duration property calls for thumbnails
• Remove unnecessary button element check for persistent progress bar, it's always a slider
• Remove redundant checks that are already set in top_titlebar
• Remove unnecessary or 0 for volume property, default is already set to 0
• Remove state.touchtime = nil from mouse_leave() first line. This makes the branch right after it always false. Not sure why it was there in the first place
• Reduce get_hidetimeout() calls in run_autohide()
• Check state.active_element == nil once in run_autohide()