[ox/std] Make HashMap use default constructor for T

(synced from a14eb5a0bc)

src/ox/std/hashmap.hpp

@@ -22,7 +22,7 @@ class HashMap {
 	private:
 		struct Pair {
 			K key = {};
-			T value = {};
+			T value{};
 		};
 		Vector<K> m_keys;
 		Vector<Pair*> m_pairs;