Remove Clerk io code from backend adminhtml templates

[seansan]

I dont think we need Clerk in our backend templates

Please only show it on the frontend

0.0004 clerk_livesearch_script (not cached) Mage_Core_Block_Template app/design/frontend/base/default/template/clerk/livesearch.phtml 0.0025 clerk_tracking_script (not cached) Clerk_Clerk_Block_Tracking app/design/frontend/base/default/template/clerk/tracking.phtml 0.0004 clerk_powerstep (not cached) Clerk_Clerk_Block_Powerstep app/design/frontend/base/default/template/clerk/powerpopup.phtml 0.0004 clerk_exit_intent_script (not cached) Clerk_Clerk_Block_ExitIntent app/design/frontend/base/default/template/clerk/exitintent.phtml