dist: enable cppcheck warnings for all files

dist/tools/ci/build_and_test.sh

@@ -91,8 +91,7 @@ then
         #   Remove all but `${CI_BASE_BRANCH}` parameters to cppcheck (and remove second
         #   invocation) once all warnings of cppcheck have been taken care of
         #   in ${CI_BASE_BRANCH}.
-        run ./dist/tools/cppcheck/check.sh ${CI_BASE_BRANCH} --diff-filter=MR --error-exitcode=0
-        run ./dist/tools/cppcheck/check.sh ${CI_BASE_BRANCH} --diff-filter=AC
+        run ./dist/tools/cppcheck/check.sh ${CI_BASE_BRANCH}
         run ./dist/tools/pr_check/pr_check.sh ${CI_BASE_BRANCH}
         exit $RESULT
     fi