Fix logs sending

[JanCaha]

Fix sending logs using POST method.

[coveralls]

Pull Request Test Coverage Report for Build 16803293545

Details

• 8 of 8 (100.0%) changed or added relevant lines in 2 files are covered.
• 15 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.01%) to 80.455%

---

Files with Coverage Reduction	New Missed Lines	%
mergin/client_pull.py	15	84.39%

Totals
Change from base Build 16775335899:	0.01%
Covered Lines:	3503
Relevant Lines:	4354

---

💛 - Coveralls

[RastoHu]

@JanCaha :
Log size on local storage: 10.1 MB
Log size on Google drive: 4.1 MB, removed lines from the beginning of the file
But in general sending logs works :)