Messaging: Fix indicated issues in layouts

Follow AS recommendations

Change-Id: I7a5241651ccd3fd5ea5efce44db848e3bc3a1c12

res/layout/conversation_fragment.xml

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!--
     Copyright (C) 2015 The Android Open Source Project
+    Copyright (C) 2024 The LineageOS Project
 
     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
@@ -24,14 +25,13 @@
     <LinearLayout
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:layout_weight="1"
         android:orientation="vertical">
         <!-- This FrameLayout will take all available height (excluding media picker)
         but setting height to 0dp causes it not to shrink properly in KK, so a height of match_parent
         works equally well -->
         <FrameLayout
             android:layout_width="match_parent"
-            android:layout_height="match_parent"
+            android:layout_height="0dp"
             android:layout_weight="1" >
             <!-- Message list -->
             <androidx.recyclerview.widget.RecyclerView