Remove unnecessary MessageListView background

Author: adasiewiczr

samplekotlin/src/main/res/layout/activity_channel_2.xml

@@ -16,7 +16,6 @@
         android:id="@+id/messageListView"
         android:layout_width="0dp"
         android:layout_height="0dp"
-        android:background="#f3f5f8"
         app:layout_constraintBottom_toTopOf="@+id/messageInputView"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"

samplekotlin/src/main/res/layout/activity_channel_3.xml

@@ -26,7 +26,6 @@
         android:id="@+id/messageListView"
         android:layout_width="0dp"
         android:layout_height="0dp"
-        android:background="#f3f5f8"
         app:layout_constraintBottom_toTopOf="@+id/messageInputView"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"

samplekotlin/src/main/res/layout/activity_channel_4.xml

@@ -26,7 +26,6 @@
         android:id="@+id/messageListView"
         android:layout_width="match_parent"
         android:layout_height="0dp"
-        android:background="#f3f5f8"
         app:layout_constraintBottom_toTopOf="@+id/messageInputView"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"