[BUGFIX] Expose ContextHelp module url to JavaScript

Resolves: #90490
Releases: master
Change-Id: Idc9c1d2fb2990116933e6cc0e1700daa46778847
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63373
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>

typo3/sysext/backend/Classes/Controller/BackendController.php

@@ -128,6 +128,7 @@ public function __construct()
         $this->pageRenderer->addInlineLanguageLabelFile('EXT:core/Resources/Private/Language/debugger.xlf');
         $this->pageRenderer->addInlineLanguageLabelFile('EXT:core/Resources/Private/Language/wizard.xlf');
 
+        $this->pageRenderer->addInlineSetting('ContextHelp', 'moduleUrl', (string)$this->uriBuilder->buildUriFromRoute('help_cshmanual'));
         $this->pageRenderer->addInlineSetting('ShowItem', 'moduleUrl', (string)$this->uriBuilder->buildUriFromRoute('show_item'));
         $this->pageRenderer->addInlineSetting('RecordHistory', 'moduleUrl', (string)$this->uriBuilder->buildUriFromRoute('record_history'));
         $this->pageRenderer->addInlineSetting('NewRecord', 'moduleUrl', (string)$this->uriBuilder->buildUriFromRoute('db_new'));