raw should not be a reserved keyword

[kubatyszko]

Hi there,

We happen to have a user whose login is "raw", and it's a reserved keyword in Gitea,
I made a quick patch to remove it from the list.

I don't see a reason for it being disallowed, gitea works perfectly fine...

(I"m positive that many other reserved keywords also don't have to be disallowed)

Thanks

[codecov-io]

Codecov Report

Merging #7503 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7503      +/-   ##
==========================================
+ Coverage   41.21%   41.21%   +<.01%     
==========================================
  Files         469      469              
  Lines       63533    63533              
==========================================
+ Hits        26182    26184       +2     
+ Misses      33933    33931       -2     
  Partials     3418     3418

Impacted Files	Coverage Δ
models/user.go	50.5% <ø> (ø)	⬆️
modules/log/event.go	65.64% <0%> (+1.02%)	⬆️

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[silverwind]

It is used in raw url like https://try.gitea.io/silverwind/symlink-test/raw/branch/master/file, thought I'm not sure if that will ever conflict with usernames in other URL schemes.

[silverwind]

Also seems to be a reserved username on GitHub: https://github.com/raw. So generally I'd say we should probably also not allow to so we can at some point in the future make use of the $domain/raw namespace.