Angular build prod adds hash in CSS elements with value over 99

[coendamen]

Since version 12, the build prod (or configuration production) adds a hash to css element values greater than value 99.

for instance:

z-index : 300 becomes "z-index: #300" .

This also happens to flex-grow etc.

[JoostK]

Please see angular/angular-cli#20870.

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