[MAINTAIN-151] changed a default value of the frameborder attribute to 1 for video_embed_iframe element #8
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Original Issue, this PR is going to fix: MAINTAIN-151
Also this was discussed in this PR ymcatwincities/openy#2526
The fix should add the border to all embedded video entities
![MAINTAIN-151BorderInEmbededVideo](https://user-images.githubusercontent.com/744406/127873175-125a1436-2036-4ec5-aed6-89bd1ca8cb4d.png)
Steps for review
log as admin
go to edit node (blog post foe example)
to add a new External video entity
![MAINTAIN-151AddEmbededVideo](https://user-images.githubusercontent.com/744406/127873475-986d943f-49a8-41e3-9c53-de34bcbb9602.png)
save node and verify that iframe has border=1
![MAINTAIN-151BorderInEmbededVideo](https://user-images.githubusercontent.com/744406/127873598-4d574701-1a96-4a00-98d0-0c678b741167.png)
verify that for all themes