remove ads embedded in json if any (closes #18430)

[adirizka7]

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The issue on http://rudo.video is on some videos it has ads. When the program tries to parse the js with js_to_json it caused error because the 'events' key which was produced from ads has several js function as its value and program can't parse it as usual. I made a change to the code so when there's an 'events' key matched it will be removed. Hopefully, it won't cause any problem to the ad-free one because the ad-free videos does't have the 'events' key. CMIIW. Hope this solves #18430 .