Use try with resource to close FileReader in DB.java

[chhil]

As I migrate to the current jpos/jposee, I run sonarqube scanner and it picked this up.

jPOS-EE/modules/dbsupport/src/main/java/org/jpos/ee/DB.java

Lines 266 to 269 in 404d642

	if (f.exists())
	{
	props.load(new FileReader(f));
	}

If it makes sense, change it to the following so that the file is always closed, or add a finally block to close it.

        if (f.exists()) {
            try (FileReader fr = new FileReader(f)) {
                props.load(fr);
            }
        }