[text-box-trim] Test block-end accumulations

This patch updates a test for when the element to trim has
different `text-box-edge` value from the `text-box-edge` value
of the element that has `text-box-trim`, the same condition as
crrev.com/c/5547563, but for block-end side.

Bug: 40254880
Change-Id: Ibaaadee9ef41319c78921b116ca2daae340c3492
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5553822
Auto-Submit: Koji Ishii <kojii@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1304304}

css/css-inline/text-box-trim/text-box-trim-tall-line-001-ref.html

@@ -11,7 +11,7 @@
   line-height: 1;
   position: relative;
   top: -80px;
-  height: 220px;
+  height: 100px;
 }
 </style>
 <div class="spacer"></div>

css/css-inline/text-box-trim/text-box-trim-tall-line-001.html

@@ -12,7 +12,7 @@
   font-family: Ahem;
   font-size: 100px;
   line-height: 2;
-  text-box-trim: start;
+  text-box-trim: both;
   text-box-edge: text;
 }
 </style>