2embed.ru is down, should be easy fix

[north-ross]

The host 2embed.ru doesn't work any more, however 2embed.to and other sources do. Since this was the default host, it makes the app not work anymore.

This seems to be a pretty easy fix, either by replacing the url referenced to 2embed.ru with 2embed.to, or by replacing the default page (line 12 in viewPage.js) with vidsrc as the default rather than 2embed. Both of these seem to work fine for me.

I don't have much experience with github, but I created a fork with two branches showing the two solutions I used (only in Firefox but I imagine it's exactly the same for Chrome in this case). This fix should make the application work again.

Thank you for your work on this project!! It's been super useful :)