Fix #10459 - Resolve not being able to clear template cache

[gaspare-joubert]

When optional $view value does not contain file extension '.tpl'. When DetailView cache template directory was built using $_SESSION['groupLayout'] in TemplateHandler::buildTemplate().

In include/TemplateHandler/TemplateHandler::clearCache I have upated the IF statements to add the '.tpl' extension to $view and to check for '$_SESSION['groupLayout']'.

Motivation and Context

This is fixing a bug

How To Test This

Refer to the Issue for testing steps.

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Final checklist

• [x] My code follows the code style of this project found here.
• [ ] My change requires a change to the documentation.
• [x] I have read the How to Contribute guidelines.