Add geometry to la_pop_df

[nkshaw23]

Pull Request submission

When la_pop_df was created, no geomtery or CRS was defined. This layer undergoes an intersection and so we cant be 100% sure that the correct points are being filtered during the intersection if the layer is not in the correct CRS.

BNG CRS added, and correct geometry selected (the layer has two for some reason) to ensure pop weighted centroids are used, not the polygon boundary.

Closes or fixes

Fixes #345

Code

• [x] Requirements My/our code matches the requirements of the ticket
• [x] Functionality: New functions meet requirements in issue ticket
• [x] Compliant Code Code is as PEP 8 compliant as I can humanly make it
• [x] Code runs The code runs on my machine
• [x] Clean Code
  • [ ] Code has been linted (use your favourite linter)
  • [ ] Code adheres to DRY

Documentation (N/A)

Any new code includes all the following forms of documentation:

• [ ] Function Documentation Docstrings within the function(s') definition(s) have been created
  • [ ] Includes parameters and returns for all major functions
  • [ ] Includes data types
• [ ] Updated Documentation: Working doc has been updated and a new ticket to update the master documentation has been created.

Data (N/A)

• [ ] All data needed to run this script has been added to Sync

Testing (N/A)

• [ ] Unit tests Unit tests have been created and are passing or a new ticket to create tests has been created

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Peer Review Section

• [ ] All requirements install from (updated) requirements.txt
• [ ] Documentation has been created and is clear - check the google Doc
• [ ] Doctrings (Google format) have been created and accurately describe the function's functionality
• [ ] Unit tests pass, or if not present a new ticket to create tests has been created
• [ ] Code runs The code runs on reviewer's machine

Final approval (post-review)

The author has responded to my review and made changes to my satisfaction.

• [ ] I recommend merging this request.

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