MM-31326: Fix Striped LRU to have minimum of 1 bucket (#16531)

* MM-31326: Fix Striped LRU to have minimum of 1 bucket

https://mattermost.atlassian.net/browse/MM-31236

```release-note
NONE
```

* Using a maxInt function

store/localcachelayer/layer.go

@@ -133,7 +133,7 @@ func NewLocalCacheLayer(baseStore store.Store, metrics einterfaces.MetricsInterf
 		DefaultExpiry:          ROLE_CACHE_SEC * time.Second,
 		InvalidateClusterEvent: model.CLUSTER_EVENT_INVALIDATE_CACHE_FOR_ROLES,
 		Striped:                true,
-		StripedBuckets:         runtime.NumCPU() - 1,
+		StripedBuckets:         maxInt(runtime.NumCPU()-1, 1),
 	}); err != nil {
 		return
 	}
@@ -271,7 +271,7 @@ func NewLocalCacheLayer(baseStore store.Store, metrics einterfaces.MetricsInterf
 		DefaultExpiry:          USER_PROFILE_BY_ID_SEC * time.Second,
 		InvalidateClusterEvent: model.CLUSTER_EVENT_INVALIDATE_CACHE_FOR_PROFILE_BY_IDS,
 		Striped:                true,
-		StripedBuckets:         runtime.NumCPU() - 1,
+		StripedBuckets:         maxInt(runtime.NumCPU()-1, 1),
 	}); err != nil {
 		return
 	}
@@ -319,6 +319,13 @@ func NewLocalCacheLayer(baseStore store.Store, metrics einterfaces.MetricsInterf
 	return
 }
 
+func maxInt(a, b int) int {
+	if a > b {
+		return a
+	}
+	return b
+}
+
 func (s LocalCacheStore) Reaction() store.ReactionStore {
 	return s.reaction
 }