Fix calling s3.ls() to get also new files for the daemon version

[pnuu]

The s3.ls() call was missing refresh=True kwarg that is required by the daemon version of the S3Stalker. Without it, the call results are taken from cache and none of the new files are returned.

[coveralls]

Pull Request Test Coverage Report for Build 4797161966

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 0.0%

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Totals
Change from base Build 4699890722:	0.0%
Covered Lines:	0
Relevant Lines:	0

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💛 - Coveralls

[codecov[bot]]

Codecov Report

Merging #135 (ffc7179) into main (e3b9abc) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #135      +/-   ##
==========================================
+ Coverage   91.32%   91.33%   +0.01%     
==========================================
  Files          27       27              
  Lines        4044     4049       +5     
==========================================
+ Hits         3693     3698       +5     
  Misses        351      351              

Flag	Coverage Δ
unittests	91.33% <100.00%> (+0.01%)	:arrow_up:

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Impacted Files	Coverage Δ
pytroll_collectors/s3stalker.py	100.00% <100.00%> (ø)
pytroll_collectors/tests/test_s3stalker.py	99.47% <100.00%> (+0.01%)	:arrow_up:

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