Remove ambiguous unary operator

[marcel-necker]

Since Dart-Sass Release Version 1.55.0 there is an Strict Unary Operator Warning for ambiguous use

https://github.com/sass/dart-sass/releases/tag/1.55.0
https://sass-lang.com/documentation/breaking-changes/strict-unary

Add a space after - to clarify that it's meant to be a binary operation, or wrap it in parentheses to make it a unary operation. This will be an error in future versions of Sass.

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