Use the fully qualified name window.location.host and not just location.host

[jiridanek]

Description

I was trying some things with jest and babel, and I encountered the following error when trying to compile the frontend code

ReferenceError: location is not defined

The Dashboard code is not suffering from this, because

1. location is defined as a global in the actual browsers
2. the Jest config defines testEnvironment: 'jest-environment-jsdom', and besides sprucing up the runtime env, this also (somehow) instructs babel to assume browser env

I want to compile without defining testEnvironment, and since there is no harm in referencing location though window, why not just do it that way?

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.31%. Comparing base (0f2b4f8) to head (0e94df1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3602   +/-   ##
=======================================
  Coverage   85.30%   85.31%           
=======================================
  Files        1395     1395           
  Lines       32047    32047           
  Branches     8983     8983           
=======================================
+ Hits        27338    27341    +3     
+ Misses       4709     4706    -3     

Files with missing lines	Coverage Δ
frontend/src/utilities/const.ts	100.00% <100.00%> (ø)

... and 4 files with indirect coverage changes

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