[@container] Change serialization of general-enclosed in test

There is an open issue saying this needs to be specified[1].

Change the expectation to align with Gecko and Chromium for now, which
both keep the original serialization for general-enclosed.

[1] w3c/csswg-drafts#7266

Change-Id: I1986ae7a7f63c2c63ef841f047034eeccdc3828d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5925360
Commit-Queue: Rune Lillesveen <[email protected]>
Reviewed-by: Steinar H Gunderson <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1368182}

css/css-conditional/container-queries/at-container-style-serialization.html

@@ -26,7 +26,7 @@
       ["style(--foo: )", "Empty declaration value - spaces"],
       ["style(--foo: )", "Empty declaration value"],
       ["style(--foo)", "No declaration value"],
-      ["style((--FOO: BAR) or ( prop: val ))", "Unknown CSS property after 'or'"],
+      ["style((--FOO: BAR) or ( prop: val  ))", "Unknown CSS property after 'or'"],
       ["style (--foo: bar)", "Not a style function with space before '('"],
       ["style(--foo: bar   baz)", "Spaces preserved in custom property value"],
       ["style(--foo: 2.100)", "Original string number in custom property value"]