Re-add bad password checker removed in commit 8b4426c7

Not sure why it was removed, apparently by accident.

exec/badpasswords.js

+// $Id: badpasswords.js,v 1.3 2019/01/11 09:38:12 rswindell Exp $
+
+"use strict";
+require("sbbsdefs.js", 'USER_DELETED');
+
+var badpasswords=0;
+var usr = new User;
+var lastuser = system.lastuser;
+for(var u=1; u <= lastuser; u++) {
+	usr.number = u;
+	if(usr == null)
+		continue;
+	if(usr.settings&(USER_DELETED|USER_INACTIVE))
+	    continue;
+	if(!system.trashcan("password",usr.security.password))
+		continue;
+	printf("%-25s: %s\r\n", usr.alias, usr.security.password);
+	badpasswords++;
+}
+
+printf("%u bad passwords found\n", badpasswords);
\ No newline at end of file