Fix compilation error VI

Author: matth-x

.github/workflows/tests.yml

@@ -52,7 +52,7 @@ jobs:
       run: ./build/mo_unit_tests --abort
     - name: Create coverage report
       run: |
-        lcov --directory . --capture --output-file coverage.info --ignore-errors: mismatch
+        lcov --directory . --capture --output-file coverage.info --ignore-errors mismatch
         lcov --remove coverage.info '/usr/*' '*/tests/*' '*/ArduinoJson.h' --output-file coverage.info
         lcov --list coverage.info
     - name: Upload coverage reports to Codecov