[ALICE3] a3 multicharm bugfix (#17648)

Author: jesgum

ALICE3/Tasks/alice3Multicharm.cxx

@@ -123,7 +123,7 @@ struct Alice3Multicharm {
   } selVals;
 
   struct : ConfigurableGroup {
-    std::string prefix = "selVals";
+    std::string prefix = "selFlags";
     Configurable<bool> applyXiMinDCAxy{"applyXiMinDCAxy", false, "Apply |DCAxy| > [0]+[1]/pT"};
     Configurable<bool> applyXiMinDCAz{"applyXiMinDCAz", false, "Apply |DCAz| > [0]+[1]/pT"};
     Configurable<bool> applyXiMinRadius{"applyXiMinRadius", false, "Apply min radius"};