Fix filter condition in getAtRules function

[ilyary]

AST parser from const css = require('@adobe/css-tools'); preserves spaces in media, e.g.: "media": "(max-width: 1279px)",

So, let us condense it as well

[quantizor]

Superseded by #454 which incorporates your fix. Thank you @ilyary for identifying the issue and proposing the solution!

[quantizor]

Thanks @ilyary! Your fix for the at-rules filter condition is included in v7.3.0.

[quantizor]

Thanks for the fix, @ilyary! Your work on the at-rule filtering informed the nested at-rule rewrite in v7.3.1, which also adds support for @container and @layer queries.