chore: avoid useless PoSePunish log spam (#5678)

## Issue being fixed or feature implemented
No need to log things like `punished MN <protxhash>, penalty 515->515
(max=515)`

(check block 907818 on testnet, it has a lot of these)

## What was done?

## How Has This Been Tested?
n/a

## Breaking Changes
n/a
## Checklist:
- [x] I have performed a self-review of my own code
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have added or updated relevant unit/integration/functional/e2e
tests
- [ ] I have made corresponding changes to the documentation
- [x] I have assigned this pull request to a milestone _(for repository
code-owners and collaborators only)_

src/evo/deterministicmns.cpp

@@ -348,7 +348,7 @@ void CDeterministicMNList::PoSePunish(const uint256& proTxHash, int penalty, boo
     newState->nPoSePenalty += penalty;
     newState->nPoSePenalty = std::min(maxPenalty, newState->nPoSePenalty);
 
-    if (debugLogs) {
+    if (debugLogs && dmn->pdmnState->nPoSePenalty != maxPenalty) {
         LogPrintf("CDeterministicMNList::%s -- punished MN %s, penalty %d->%d (max=%d)\n",
                   __func__, proTxHash.ToString(), dmn->pdmnState->nPoSePenalty, newState->nPoSePenalty, maxPenalty);
     }