Meta+AK: Make clang-format-10 clean

Author: https://github.com/BenWiederhake
Commit: 8940bc3503
Pull-request: https://github.com/SerenityOS/serenity/pull/3541
Reviewed-by: https://github.com/alimpfard
Reviewed-by: https://github.com/linusg

AK/HashMap.h

@@ -47,7 +47,7 @@ private:
     };
 
 public:
-    HashMap() {}
+    HashMap() { }
 
     bool is_empty() const { return m_table.is_empty(); }
     size_t size() const { return m_table.size(); }