[Modules] Fixed Bug Bastion Host remove additional PIP

[elbatane]

Description

Solving Bug: https://github.com/Azure/ResourceModules/issues/1716 by removing "additionalPublicIpConfigurations" variable as Bastion only supports 1 PIP

Pipeline references

Pipeline

Type of Change

Please delete options that are not relevant.

• [X] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Update to documentation

Checklist

• [ ] I'm sure there are no other open Pull Requests for the same update/change
• [ ] My corresponding pipelines / checks run clean and green without any errors or warnings
• [ ] My code follows the style guidelines of this project
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation (readme)
• [ ] I did format my code