Fix for custom dependency install failing due to typo in template generator

[trushant05]

Description

The template generator is involved when project / task is created using ./isaaclab.sh -n [Project Name]. Inside the source directory in config/extension.toml file there is a provision to add custom apt or ros_ws dependency as mentioned here which is current failing.

The problem is result of a typo in the template generator extension config file which is current [isaaclab_settings] and should be [isaac_lab_settings] instead. The file is located at:

IsaacLab/tools/template/templates/extension/config/extension.toml

Fixes #3196

Type of change

• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Screenshots

Before	After

Checklist

• I have run the pre-commit checks with ./isaaclab.sh --format
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• I have updated the changelog and the corresponding version in the extension's config/extension.toml file
• I have added my name to the CONTRIBUTORS.md or my name already exists there