[BUGFIX] Record history shows two back buttons in docheader

The back-button is loaded twice in the record history module.
Also we add back the CSH which was missing too.

Change-Id: Ib509661bdb814f27ebff633d08ef85ada0b8e8ec
Resolves: #49338
Releases: 6.2, 6.1, 6.0
Reviewed-on: https://review.typo3.org/21610
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn
Reviewed-by: Anja Leichsenring
Tested-by: Anja Leichsenring

typo3/sysext/backend/Resources/Private/Templates/show_rechis.html

@@ -2,8 +2,8 @@
 <div class="typo3-fullDoc">
 	<div id="typo3-docheader">
 		<div class="typo3-docheader-functions">
-			<div class="left">###BUTTONLIST_LEFT###</div>
-			<div class="right">###BUTTONLIST_RIGHT###</div>
+			<div class="left">###CSH###</div>
+			<div class="right"></div>
 		</div>
 		<div class="typo3-docheader-buttons">
 			<div class="left">###BUTTONLIST_LEFT###</div>