Pick the first or last baseline as appropriate (#31705)

The old logic was always picking the last baseline, but this should only
happen for inline-blocks.

Since replaced elements and flex containers aren't currently setting
their baselines, this is only an improvement for inline-tables.

tests/wpt/meta/MANIFEST.json

@@ -106880,6 +106880,19 @@
         {}
        ]
       ],
+      "table-vertical-align-baseline-009.xht": [
+       "4620848ddc19661b5ddfaa34cefc9c9eee266dcb",
+       [
+        null,
+        [
+         [
+          "/css/CSS2/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
       "table-visual-layout-017.xht": [
        "25067cb68385a520a10a31949d742b520c7e9cd6",
        [