Remove extra {} in declaration

Author: SRombauts

include/SQLiteCpp/Statement.h

@@ -707,7 +707,7 @@ class Statement
     bool                    mbDone{false};          //!< true when the last executeStep() had no more row to fetch
 
     /// Map of columns index by name (mutable so getColumnIndex can be const)
-    mutable std::map<std::string, int>  mColumnNames{};
+    mutable std::map<std::string, int>  mColumnNames;
 };