Reduce default max load factor to 0.75.

Author: Tessil

tsl/ordered_hash.h

@@ -1264,7 +1264,7 @@ class ordered_hash: private Hash, private KeyEqual {
 
 public:
     static const size_type DEFAULT_INIT_BUCKETS_SIZE = 16;
-    static constexpr float DEFAULT_MAX_LOAD_FACTOR = 0.9f;
+    static constexpr float DEFAULT_MAX_LOAD_FACTOR = 0.75f;
 
 private:    
     static const size_type REHASH_ON_HIGH_NB_PROBES__NPROBES = 128;