Clarify unary for Sass

[frankharkins]

Closes #17593

https://sass-lang.com/documentation/breaking-changes/strict-unary/

This line causes a deprecation warning in newer versions of Sass. This PR makes a small edit to solve the warning. This shouldn't change the behaviour of the style as Sass interprets the syntax as a subtraction. This is also most likely what the original author intended, otherwise they could have omitted the second -$spacing-05.

Changelog

Changed

• Changed style to make compatible with https://sass-lang.com/d/strict-unary.

Testing / Reviewing

Probably easiest way to verify this is to go to the CodeSandbox repro and add the space to node_modules/@carbon/styles/scss/components/modal/_modal.scss (L128).

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[frankharkins]

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