Use more concise C++17 namespace syntax

[Neverlord]

Just a small nitpick I've found.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6869d05) 70.91% compared to head (e5d0f26) 70.93%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1729      +/-   ##
==========================================
+ Coverage   70.91%   70.93%   +0.02%     
==========================================
  Files         645      645              
  Lines       27095    27094       -1     
  Branches     2982     2981       -1     
==========================================
+ Hits        19214    19220       +6     
+ Misses       6188     6187       -1     
+ Partials     1693     1687       -6     

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[riemass]

Just as a note, there's a clang-tidy check for this that we could integrate. #1435

[Neverlord]

Just as a note, there's a clang-tidy check for this that we could integrate. #1435

I've played around with clang-tidy yesterday, that's how I found it.