Fix alt text modal styling (#31844)

app/javascript/styles/mastodon-light/diff.scss

@@ -159,8 +159,8 @@
 .error-modal,
 .onboarding-modal,
 .compare-history-modal,
-.report-modal__comment .setting-text__wrapper,
-.report-modal__comment .setting-text,
+.report-modal__comment,
+.report-modal__comment,
 .announcements,
 .picture-in-picture__header,
 .picture-in-picture__footer,
@@ -169,6 +169,11 @@
   border: 1px solid var(--background-border-color);
 }
 
+.setting-text__wrapper,
+.setting-text {
+  border: 1px solid var(--background-border-color);
+}
+
 .reactions-bar__item:hover,
 .reactions-bar__item:focus,
 .reactions-bar__item:active {
@@ -198,14 +203,6 @@
   color: $white;
 }
 
-.report-modal__comment {
-  border-right-color: lighten($ui-base-color, 8%);
-}
-
-.report-modal__container {
-  border-top-color: lighten($ui-base-color, 8%);
-}
-
 .column-settings__hashtags .column-select__option {
   color: $white;
 }