show title on status message instead machine name

[pradpnayak]

Overview

When a dedupe rule is used to find duplicate contacts, if no duplicates found then it pops up with message 'No possible duplicates were found using [Rule Name] rule.', Some times machine and title differ and creates confusion to user when they see this message.

This PR provides fix to use title of rule instead name
Output:
'No possible duplicates were found using [Rule Title] rule.'

Before

After

[civibot]

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[colemanw]

This looks good. I verified that the variable $ruleGroupName isn't being used elsewhere, so there shouldn't be any side-effects.