[BUGFIX] Use correct fluid variable name in AnalyzerTreePanel.html

With introducing the overhaul of the TypoScript parser and the
related parts like the ObjectBrowser and Template Analyzer, it
has been overseen that a invalid variable has been used in a
fluid partial.

This patch changes the partial to use the correct variable.

Resolves: #98087
Releases: main
Change-Id: I9c0ec2d99b557fe4df147402e53d04d4f29f76da
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/75376


Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Simon Schaufelberger <simonschaufi+typo3@gmail.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Simon Schaufelberger <simonschaufi+typo3@gmail.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>