Update hint text for group story replies.

app/src/main/java/org/thoughtcrime/securesms/stories/viewer/reply/composer/StoryReplyComposer.kt

@@ -98,6 +98,14 @@ class StoryReplyComposer @JvmOverloads constructor(
     }
   }
 
+  var hint: CharSequence
+    get() {
+      return input.hint
+    }
+    set(value) {
+      input.hint = value
+    }
+
   fun setQuote(messageRecord: MediaMmsMessageRecord) {
     quoteView.setQuote(
       GlideApp.with(this),

app/src/main/java/org/thoughtcrime/securesms/stories/viewer/reply/group/StoryGroupReplyFragment.kt

@@ -181,6 +181,7 @@ class StoryGroupReplyFragment :
     StoryGroupReplyItem.register(adapter)
 
     composer.callback = this
+    composer.hint = getString(R.string.StoryViewerPageFragment__reply_to_group)
 
     onPageSelected(findListener<StoryViewsAndRepliesPagerParent>()?.selectedChild ?: StoryViewsAndRepliesPagerParent.Child.REPLIES)