Unmirror checkboxes in RTL layouts

briar-android/src/main/res/drawable/message_delivered.xml

@@ -2,7 +2,6 @@
 	xmlns:android="http://schemas.android.com/apk/res/android"
 	android:width="16dp"
 	android:height="16dp"
-	android:autoMirrored="true"
 	android:viewportHeight="24.0"
 	android:viewportWidth="24.0">
 	<path

briar-android/src/main/res/drawable/message_delivered_white.xml

@@ -2,7 +2,6 @@
 	xmlns:android="http://schemas.android.com/apk/res/android"
 	android:width="16dp"
 	android:height="16dp"
-	android:autoMirrored="true"
 	android:viewportHeight="24.0"
 	android:viewportWidth="24.0">
 	<path

briar-android/src/main/res/drawable/message_sent.xml

@@ -2,7 +2,6 @@
 	xmlns:android="http://schemas.android.com/apk/res/android"
 	android:width="16dp"
 	android:height="16dp"
-	android:autoMirrored="true"
 	android:viewportHeight="24.0"
 	android:viewportWidth="24.0">
 	<path

briar-android/src/main/res/drawable/message_sent_white.xml

@@ -2,7 +2,6 @@
 	xmlns:android="http://schemas.android.com/apk/res/android"
 	android:width="16dp"
 	android:height="16dp"
-	android:autoMirrored="true"
 	android:viewportHeight="24.0"
 	android:viewportWidth="24.0">
 	<path