Remove location from vent windows command

[sethterashima]

The location field is not required or enforced for the vent windows command for vehicles that support this protocol. Removing from the protobuf definition to avoid confusion.

Description

Removes unused protobuf field to avoid causing confusion about whether location is required to close windows.

Fixes #239

Type of change

Please select all options that apply to this change:

• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Bug fix (non-breaking change which fixes an issue)
• Documentation update

Checklist:

Confirm you have completed the following steps:

• My code follows the style of this project.
• I have performed a self-review of my code.
• I have made corresponding updates to the documentation.
• I have added/updated unit tests to cover my changes.

[itsMeDavidV]

Great, thanks for clarifying this!