chore(Generator): update theme spacing syntax in generator SCSS variables

[Cata1989]

Description

The purpose of this PR is to update our generator for SCSS variables to be consistent with the changes in this PR: #1064

Related Issue

Fixes #ISSUE_NUMBER

Documentation

Screenshots (if applicable)

Checklist

• I have read the CONTRIBUTING document.
• I have read the CODE OF CONDUCT document.
• I have reviewed my own code.
• I have tested the changes locally.
• I have updated the documentation (if applicable).
• I have added unit tests and e2e tests (if applicable).
• I have requested reviews from relevant team members.

Additional Notes

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✅ Successfully ran 5 targets

• nx run beeq:storybook-build --output-style=stream-without-prefixes
• nx affected -t e2e --exclude=*,!tag:core --parallel=3 --base=2700165e195bddb7dbfce40aa718ba1cc08b31e2 --head=47450a0bb12d84444b5d59f78665b415ac467fd3 --ci --code-coverage --runInBand
• nx affected -t test --exclude=*,!tag:core --parallel=3 --base=2700165e195bddb7dbfce40aa718ba1cc08b31e2 --head=47450a0bb12d84444b5d59f78665b415ac467fd3 --ci --runInBand
• nx affected -t lint --exclude=*,!tag:publishable --parallel=3 --base=2700165e195bddb7dbfce40aa718ba1cc08b31e2 --head=47450a0bb12d84444b5d59f78665b415ac467fd3
• nx affected -t build --exclude=*,!tag:publishable --parallel=3 --base=2700165e195bddb7dbfce40aa718ba1cc08b31e2 --head=47450a0bb12d84444b5d59f78665b415ac467fd3

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[sonarqubecloud]

Quality Gate passed

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0 Accepted issues

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