cql3: fix bad bracing in maps.hh

Random open and close brace, luckily no harm done.

cql3/maps.hh

@@ -352,7 +352,6 @@ public:
 
     static void do_put(mutation& m, const exploded_clustering_prefix& prefix, const update_parameters& params,
             shared_ptr<term> t, const column_definition& column, tombstone ts = {}) {
-    {
         auto value = t->bind(params._options);
         auto map_value = dynamic_pointer_cast<maps::value>(value);
         if (column.type->is_multi_cell()) {
@@ -404,8 +403,6 @@ public:
 #endif
 };
 
-};
-
 }
 
 #endif