Fix Code Coverage: ignore unused exclude patterns

- Add 'unused' to ignore-errors list for lcov --remove
- Fixes: ERROR: 'exclude' pattern '*/build/*' is unused
- Coverage data successfully collected: 94.9% line coverage

Author: Peter Neiss

.github/workflows/coverage.yml

@@ -53,7 +53,7 @@ jobs:
           '*/testes/*' \
           --output-file coverage_filtered.info \
           --rc branch_coverage=1 \
-          --ignore-errors mismatch,gcov,inconsistent
+          --ignore-errors mismatch,gcov,inconsistent,unused
 
         # Generate HTML report
         genhtml coverage_filtered.info \