Fix race condition that fails to hide video loading indicator (#28297)
Fix race condition that fails to hide video loading indicator (#28297)

Auto-playing videos might have already started pllaying by the time we attach the playing event listener. Since there isn't a direct attribute to tell whether a video is playing, this checks whether the `currentTime` is 0.

Fixes #28275
zhouyx/amphtml,nexxtv/amphtml,ampproject/amphtml,danielrozenberg/amphtml,smartadserver/amphtml,jpettitt/amphtml,nexxtv/amphtml,voyagegroup/amphtml,alanorozco/amphtml,nexxtv/amphtml,lannka/amphtml,honeybadgerdontcare/amphtml,media-net/amphtml,danielrozenberg/amphtml,Gregable/amphtml,jridgewell/amphtml,jpettitt/amphtml,jpettitt/amphtml,jpettitt/amphtml,yandex-pcode/amphtml,smartadserver/amphtml,prateekbh/amphtml,voyagegroup/amphtml,prateekbh/amphtml,danielrozenberg/amphtml,voyagegroup/amphtml,ampproject/amphtml,ampproject/amphtml,jpettitt/amphtml,mhc-gh/amphtml,jmadler/amphtml,yandex-pcode/amphtml,rsimha-amp/amphtml,smartadserver/amphtml,alanorozco/amphtml,voyagegroup/amphtml,jmadler/amphtml,prateekbh/amphtml,media-net/amphtml,mhc-gh/amphtml,nexxtv/amphtml,jpettitt/amphtml,honeybadgerdontcare/amphtml,sharethrough/amphtml,zhouyx/amphtml,danielrozenberg/amphtml,sharethrough/amphtml,jpettitt/amphtml,jridgewell/amphtml,rsimha-amp/amphtml,rsimha-amp/amphtml,ampproject/amphtml,ampproject/amphtml,sharethrough/amphtml,adup-tech/amphtml,jridgewell/amphtml,Gregable/amphtml,mhc-gh/amphtml,Gregable/amphtml,alanorozco/amphtml,jridgewell/amphtml,mhc-gh/amphtml,yandex-pcode/amphtml,zhouyx/amphtml,alanorozco/amphtml,jridgewell/amphtml,zhouyx/amphtml,media-net/amphtml,jmadler/amphtml,danielrozenberg/amphtml,mhc-gh/amphtml,sharethrough/amphtml,alanorozco/amphtml,smartadserver/amphtml,honeybadgerdontcare/amphtml,yandex-pcode/amphtml,alanorozco/amphtml,lannka/amphtml,lannka/amphtml,media-net/amphtml,adup-tech/amphtml,honeybadgerdontcare/amphtml,voyagegroup/amphtml,yandex-pcode/amphtml,nexxtv/amphtml,zhouyx/amphtml,yandex-pcode/amphtml,jmadler/amphtml,ampproject/amphtml,smartadserver/amphtml,rsimha-amp/amphtml,jmadler/amphtml,lannka/amphtml,media-net/amphtml,lannka/amphtml,adup-tech/amphtml,prateekbh/amphtml,lannka/amphtml,danielrozenberg/amphtml,jridgewell/amphtml,mhc-gh/amphtml,yandex-pcode/amphtml,adup-tech/amphtml,ampproject/amphtml,danielrozenberg/amphtml,honeybadgerdontcare/amphtml,media-net/amphtml,Gregable/amphtml,adup-tech/amphtml,Gregable/amphtml,zhouyx/amphtml,mhc-gh/amphtml,rsimha-amp/amphtml,media-net/amphtml,prateekbh/amphtml,Gregable/amphtml,lannka/amphtml,voyagegroup/amphtml,jmadler/amphtml,honeybadgerdontcare/amphtml,sharethrough/amphtml,voyagegroup/amphtml,smartadserver/amphtml,rsimha-amp/amphtml,prateekbh/amphtml,jpettitt/amphtml,nexxtv/amphtml,Gregable/amphtml,danielrozenberg/amphtml,prateekbh/amphtml,Gregable/amphtml,honeybadgerdontcare/amphtml,sharethrough/amphtml,rsimha-amp/amphtml,adup-tech/amphtml,jridgewell/amphtml,mhc-gh/amphtml,nexxtv/amphtml,ampproject/amphtml,alanorozco/amphtml,media-net/amphtml,zhouyx/amphtml,alanorozco/amphtml