♻️amp-subscriptions: use [hidden] to toggle display (#17820)
♻️amp-subscriptions: use [hidden] to toggle display (#17820)

* amp-subscriptions: use [hidden] to toggle display

This is a temporary change to remove `display: none` mutations using `setStyle` and friends.

The hidden attribute sets `display: none !important` via amp.css, so this should accomplish the same goals.

* Update dialog.js

Gregable/amphtml,jmadler/amphtml,erwinmombay/amphtml,yieldbot/amphtml,sebastianbenz/amphtml,ampproject/amphtml,zhouyx/amphtml,zhangsu/amphtml,yandex-pcode/amphtml,voyagegroup/amphtml,erwinmombay/amphtml,src-code/amphtml,rsimha-amp/amphtml,cory-work/amphtml,adup-tech/amphtml,tlong2/amphtml,cvializ/amphtml,smartadserver/amphtml,dotandads/amphtml,Gregable/amphtml,danielrozenberg/amphtml,jridgewell/amphtml,honeybadgerdontcare/amphtml,smartadserver/amphtml,erwinmombay/amphtml,jmadler/amphtml,media-net/amphtml,voyagegroup/amphtml,zhangsu/amphtml,Gregable/amphtml,cvializ/amphtml,src-code/amphtml,lannka/amphtml,pedjoni8/amphtml,zhangsu/amphtml,taboola/amphtml,danielrozenberg/amphtml,widespace-os/amphtml,tlong2/amphtml,zhouyx/amphtml,jmadler/amphtml,laterpay/amphtml,laterpay/amphtml,sharethrough/amphtml,techhtml/amphtml,chaveznvg/amphtml,yandex-pcode/amphtml,prateekbh/amphtml,media-net/amphtml,sebastianbenz/amphtml,voyagegroup/amphtml,chaveznvg/amphtml,jpettitt/amphtml,koshka/amphtml,Gregable/amphtml,pedjoni8/amphtml,jmadler/amphtml,lannka/amphtml,yieldbot/amphtml,rsimha-amp/amphtml,smartadserver/amphtml,rsimha-amp/amphtml,koshka/amphtml,BenDz/amphtml,danielrozenberg/amphtml,honeybadgerdontcare/amphtml,smartadserver/amphtml,koshka/amphtml,jridgewell/amphtml,techhtml/amphtml,lannka/amphtml,tlong2/amphtml,sebastianbenz/amphtml,ampproject/amphtml,mhc-gh/amphtml,src-code/amphtml,yandex-pcode/amphtml,honeybadgerdontcare/amphtml,smartadserver/amphtml,widespace-os/amphtml,cvializ/amphtml,src-code/amphtml,alanorozco/amphtml,yandex-pcode/amphtml,yieldbot/amphtml,dotandads/amphtml,laterpay/amphtml,rsimha-amp/amphtml,ampproject/amphtml,pedjoni8/amphtml,Gregable/amphtml,cory-work/amphtml,prateekbh/amphtml,jmadler/amphtml,alanorozco/amphtml,sharethrough/amphtml,rsimha-amp/amphtml,adup-tech/amphtml,adup-tech/amphtml,yieldbot/amphtml,chaveznvg/amphtml,src-code/amphtml,prateekbh/amphtml,zhouyx/amphtml,media-net/amphtml,jpettitt/amphtml,techhtml/amphtml,BenDz/amphtml,nexxtv/amphtml,voyagegroup/amphtml,alanorozco/amphtml,src-code/amphtml,honeybadgerdontcare/amphtml,tlong2/amphtml,prateekbh/amphtml,mhc-gh/amphtml,nexxtv/amphtml,danielrozenberg/amphtml,lannka/amphtml,tlong2/amphtml,adup-tech/amphtml,widespace-os/amphtml,kamtschatka/amphtml,techhtml/amphtml,alanorozco/amphtml,yandex-pcode/amphtml,taboola/amphtml,jridgewell/amphtml,rsimha-amp/amphtml,media-net/amphtml,sharethrough/amphtml,prateekbh/amphtml,tlong2/amphtml,yandex-pcode/amphtml,sebastianbenz/amphtml,taboola/amphtml,laterpay/amphtml,adup-tech/amphtml,taboola/amphtml,ampproject/amphtml,voyagegroup/amphtml,erwinmombay/amphtml,cvializ/amphtml,jmadler/amphtml,techhtml/amphtml,yieldbot/amphtml,danielrozenberg/amphtml,prateekbh/amphtml,jpettitt/amphtml,alanorozco/amphtml,Gregable/amphtml,erwinmombay/amphtml,kamtschatka/amphtml,media-net/amphtml,cvializ/amphtml,chaveznvg/amphtml,widespace-os/amphtml,cory-work/amphtml,sebastianbenz/amphtml,nexxtv/amphtml,adup-tech/amphtml,chaveznvg/amphtml,dotandads/amphtml,zhangsu/amphtml,media-net/amphtml,zhouyx/amphtml,chaveznvg/amphtml,BenDz/amphtml,dotandads/amphtml,voyagegroup/amphtml,widespace-os/amphtml,widespace-os/amphtml,kamtschatka/amphtml,lannka/amphtml,prateekbh/amphtml,mhc-gh/amphtml,nexxtv/amphtml,cory-work/amphtml,jridgewell/amphtml,danielrozenberg/amphtml,ampproject/amphtml,zhangsu/amphtml,media-net/amphtml,zhangsu/amphtml,kamtschatka/amphtml,zhouyx/amphtml,kamtschatka/amphtml,jpettitt/amphtml,pedjoni8/amphtml,lannka/amphtml,erwinmombay/amphtml,jpettitt/amphtml,jpettitt/amphtml,techhtml/amphtml,rsimha-amp/amphtml,lannka/amphtml,danielrozenberg/amphtml,Gregable/amphtml,yandex-pcode/amphtml,sharethrough/amphtml,cory-work/amphtml,dotandads/amphtml,honeybadgerdontcare/amphtml,sharethrough/amphtml,taboola/amphtml,BenDz/amphtml,cory-work/amphtml,alanorozco/amphtml,Gregable/amphtml,laterpay/amphtml,pedjoni8/amphtml,laterpay/amphtml,sebastianbenz/amphtml,mhc-gh/amphtml,sharethrough/amphtml,jpettitt/amphtml,cvializ/amphtml,kamtschatka/amphtml,mhc-gh/amphtml,jridgewell/amphtml,jridgewell/amphtml,jridgewell/amphtml,mhc-gh/amphtml,zhouyx/amphtml,media-net/amphtml,alanorozco/amphtml,koshka/amphtml,voyagegroup/amphtml,koshka/amphtml,ampproject/amphtml,mhc-gh/amphtml,honeybadgerdontcare/amphtml,pedjoni8/amphtml,BenDz/amphtml,honeybadgerdontcare/amphtml,nexxtv/amphtml,dotandads/amphtml,nexxtv/amphtml,alanorozco/amphtml,taboola/amphtml,taboola/amphtml,nexxtv/amphtml,jpettitt/amphtml,ampproject/amphtml,zhouyx/amphtml,yieldbot/amphtml,koshka/amphtml,cory-work/amphtml,ampproject/amphtml,BenDz/amphtml,danielrozenberg/amphtml,mhc-gh/amphtml,smartadserver/amphtml