Crostini: Update remove linux button aria attributes

 - There is now only one stop for the entire row.

bug: 1031368
test: manual inspection
Change-Id: I541f0c3d7fd8303e5ac9428f497f651332d402e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462384Reviewed-by: Jimmy Gong <jimmyxgong@chromium.org>
Commit-Queue: Michael Checo <michaelcheco@google.com>
Cr-Commit-Position: refs/heads/master@{#817696}

chrome/browser/resources/settings/chromeos/crostini_page/crostini_subpage.html

@@ -131,7 +131,8 @@
           $i18n{crostiniRemove}
         </div>
         <cr-button on-click="onRemoveClick_"
-            aria-labelledby="removeCrostiniLabel"
+            aria-label="$i18n{crostiniRemoveButton}"
+            aria-describedby="removeCrostiniLabel"
             deep-link-focus-id$="[[Setting.kUninstallCrostini]]">
           $i18n{crostiniRemoveButton}
         </cr-button>