Remove invalid singer-decimal formats in locations schema

[bryantgray]

Description of change

• Removes invalid singer-decimal format from latitude and longitude in the coordinates field from the locations stream

Manual QA steps

• N/A. Schema type is still string.

Risks

• Low. singer-decimal was never a valid format.

Rollback steps

• revert this branch

AI generated code

https://internal.qlik.dev/general/ways-of-working/code-reviews/#guidelines-for-ai-generated-code

• this PR has been written with the help of GitHub Copilot or another generative AI tool