Bug 1933627 [wpt PR 49388] - fixes background-size tests for two valu…

…es serialization, a=testonly

Automatic update from web-platform-tests
fixes background-size tests for two values serialization (#49388)

* Update background-332.html
* Update background-size-001.html

This is fixing some WPT tests related to background-size results
being serialized as two values, which is the new behavior of WebKit.
    Some tests currently contradict themselves on WPT.
    http://wpt.live/css/css-backgrounds/background-size-001.html
    https://wpt.live/css/css-backgrounds/parsing/background-size-computed.html

So this PR makes it uniform and changes the expectation files.

This is dependent on a resolution from the CSS WG about the two values system.
w3c/csswg-drafts#7802

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wpt-commits: bcd44416f9be3f84486ced8b1e36d76a3ec27880
wpt-pr: 49388

UltraBlame original commit: 42a224db37fb0e2e5f423453a63c4fc1ee93bd33

testing/web-platform/tests/css/css-backgrounds/background-332.html

@@ -440,6 +440,7 @@
 )
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 160px
+auto
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 background

testing/web-platform/tests/css/css-backgrounds/background-size-001.html

@@ -498,6 +498,7 @@
 )
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 0px
+auto
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 background
@@ -565,6 +566,7 @@
 )
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 0px
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@@ -632,6 +634,7 @@
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@@ -698,6 +701,7 @@
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 15px
+auto
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@@ -766,6 +770,7 @@
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 0
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+auto
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@@ -834,6 +839,7 @@
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@@ -902,6 +908,7 @@
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@@ -1174,6 +1181,7 @@
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 15px
+auto
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@@ -1381,6 +1389,7 @@
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 50
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+auto
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