netpen: use HRuleStyle enum instead of deprecated `ALL` keyword #55

All 22 tests pass in 2s

22 tests - 20 22 ✔️ - 16 2s ⏱️ -46s
  1 suites ±  0   0 💤 -   4
  1 files ±  0   0 ❌ ±  0

Results for commit b511429. ± Comparison against earlier commit e495099.