This pull request addresses [FINERACT-2081](https://issues.apache.org/jira/browse/FINERACT-2081).

The `toString()` method in several Enum classes has been simplified. The previous implementation:

fineract-accounting/src/main/java/org/apache/fineract/accounting/financialactivityaccount/api/FinancialActivityAccountsJsonInputParams.java

@@ -48,7 +48,7 @@ public enum FinancialActivityAccountsJsonInputParams {
 
     @Override
     public String toString() {
-        return name().toString().replaceAll("_", " ");
+        return name().replace("_", " ");
     }
 
     public String getValue() {