Fix blur for Media Previews, sticker in All Messages, Names, and Profile Pictures

[aryomuzakki]

Fixing for issue #49 and maybe for issue #42 and #46

Tested in

• OS: Windows 10 version 22H2 build 19045.3803
• Browser: Chrome v120.0.6099.217, Brave v1.61.116 Chromium v120.0.6099.217, Firefox v121.0.1
• Whatsapp v2.2402.5

Note that contact attachment get blurred by media preview toggle, and also by profile pic and name toggle, The blur amount is different, but I think that is fine. I use the same selectors.

Btw, I found out that the order of stylesheets doesn't depend on the order of the toggle, and I think it should be in a fixed order.

Please review, and thank you @LukasLen

[LukasLen]

I will merge this into the version 3 branch as I would like to port to manifest v3 before releasing.