TH3 palette title was equal to the z-axis title

[couet]

The TH3 Palette title was wrongly equal to the za-xis title.
this was found here:
https://root-forum.cern.ch/t/z-bad-label-for-palette-axis-in-th3d/53317/4

[phsft-bot]

Starting build on ROOT-debian10-i386/soversion, ROOT-performance-centos8-multicore/cxx17, ROOT-ubuntu18.04/nortcxxmod, ROOT-ubuntu2004/python3, mac12/noimt, mac11/cxx14, windows10/cxx14
How to customize builds

[phsft-bot]

Build failed on ROOT-ubuntu2004/python3.
Running on root-ubuntu-2004-1.cern.ch:/home/sftnight/build/workspace/root-pullrequests-build
See console output.

Errors:

• [2023-01-31T09:50:25.562Z] FAILED: tmva/pymva/test/CMakeFiles/SofieCompileModels_Keras.util

[phsft-bot]

Build failed on mac12/noimt.
Running on macphsft18.dyndns.cern.ch:/Users/sftnight/build/jenkins/workspace/root-pullrequests-build
See console output.

Warnings:

• [2023-01-31T09:49:38.749Z] /Users/sftnight/build/jenkins/workspace/root-pullrequests-build/root/core/base/src/TDirectory.cxx:1292:7: warning: 'sprintf' is deprecated: This function is provided for compatibility reasons only. Due to security concerns inherent in the design of sprintf(3), it is highly recommended that you use snprintf(3) instead. [-Wdeprecated-declarations]