fix: avoid doing [0] on a promise instead of on the awaited result

[Julusian]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

Bug fix

• What is the current behavior? (You can also link to an open issue here)

This is a couple of lines that look to be actual bugs, when I found when enabling noImplicitAny in the typescript config

• Other information:

Status

• Code documentation for the relevant parts in the code have been added/updated by the PR author
• The functionality has been tested by the PR author
• Automated tests to cover the new functionality and/or guard against regressions have been added
• The functionality has been tested by NRK

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (ef4a86f) 58.05% compared to head (a782176) 58.15%.
Report is 3 commits behind head on release50.

Additional details and impacted files

@@              Coverage Diff              @@
##           release50    #1047      +/-   ##
=============================================
+ Coverage      58.05%   58.15%   +0.10%     
=============================================
  Files            479      479              
  Lines          78390    78470      +80     
  Branches        4097     4151      +54     
=============================================
+ Hits           45508    45633     +125     
+ Misses         32821    32780      -41     
+ Partials          61       57       -4     

Files	Coverage Δ
meteor/server/api/cleanup.ts	100.00% <100.00%> (ø)
meteor/server/api/ExternalMessageQueue.ts	68.14% <0.00%> (+0.59%)	⬆️

... and 10 files with indirect coverage changes

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