Don’t add spaces to negative numbers following a comma

[thecrypticace]

Given an arbitrary value like mt-[clamp(0.25rem,-0.6731rem+4.1026vw,4.25rem)] we would incorrectly "fix" the operator spacing for the negative number if it followed a comma by inserting a space. However, the only valid incantation here is to not have a space.

Before:

.mt-\[clamp\(0\2c -0\.5rem\+4vw\2c 4rem\)\] {
  margin-top: clamp(0, - 0.5rem + 4vw,4rem);
}

After:

.mt-\[clamp\(0\2c -0\.5rem\+4vw\2c 4rem\)\] {
  margin-top: clamp(0,-0.5rem + 4vw,4rem);
}

Fixes #12318