Cobertura line coverage results is wrong

[akash-manna-sky]

Cobertura line coverage results is wrong

Fixes #253

Testing done

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[uhafner]

I'm not sure that the problem can be solved at all with the current implementation: the counters have the following semantics:

• 0 / 0: No line coverage
• 1 / 1: Line Coverage
• 0 / n: No line coverage, no branches covered
• m / n: Line coverage, m branches covered.

It is currently not possible to show line covered but branches are zero covered.