Messages: Only youuuuu...

* Removing the arrow from the message bubbles and adding a little
  rounding to them and the input bar already does a lot in
  modernizing the look of the app

Change-Id: Ia6466968553856fdf2ea15c10cfed79402e36a5d

res/drawable/msg_bubble_input_rounded.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     SPDX-FileCopyrightText: 2023 The LineageOS Project
+     SPDX-License-Identifier: Apache-2.0
+-->
+
+<shape
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+
+    <solid android:color="@android:color/white" />
+    <corners android:radius="28dp" />
+</shape>