Fix HLS tests

[Karolk99]

No description provided.

[codecov]

Codecov Report

Merging #282 (c463e82) into master (189afc1) will increase coverage by 0.58%.
The diff coverage is 77.27%.

@@            Coverage Diff             @@
##           master     #282      +/-   ##
==========================================
+ Coverage   62.38%   62.96%   +0.58%     
==========================================
  Files          43       44       +1     
  Lines        2092     2125      +33     
==========================================
+ Hits         1305     1338      +33     
  Misses        787      787              

Impacted Files	Coverage Δ
lib/membrane_rtc_engine/endpoints/hls_endpoint.ex	78.75% <60.00%> (+1.92%)	⬆️
test/support/hls_storage.ex	91.66% <91.66%> (ø)

... and 3 files with indirect coverage changes

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