appview/pages: uniform height for string actions

Signed-off-by: oppiliappan <[e-mail]>

appview/pages/templates/strings/string.html

···
         <span class="select-none">/</span>
         <a href="/strings/{{ $ownerId }}/{{ .String.Rkey }}" class="font-bold">{{ .String.Filename }}</a>
       </div>
-      <div class="flex gap-2 text-base">
+      <div class="flex gap-2 items-stretch text-base">
         {{ if and .LoggedInUser (eq .LoggedInUser.Did .String.Did) }}
           <a class="btn flex items-center gap-2 no-underline hover:no-underline p-2 group"
              hx-boost="true"