Bug fix: Make Opera browser recongizable

[patimatnazhm]

Description

I've re-ordered a BROWSERS tuple in user_sessions/templatetags/user_sessions.py and renamed the Opera browser in the tuple, that is supposed to be recognizable out of a user agent. Template filter device have been trying to recognize Opera browser by name Opera, while user agent detects it as OPR. Example of user agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Safari/537.36 OPR/76.0.4017.123.

Motivation and Context

It fixes an open issue #134

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[Bouke]

When Opera decided to ditch their own rendering engine (Presto) and jump on the WebKit train (later Blink) in 2013, they also start using a new User-Agent apparently. I guess we can stop trying to recognise such ancient browsers.