Start refactoring encrypt ui, EncryptFileActivity no longer crashing

OpenKeychain/src/main/res/layout/encrypt_files_fragment.xml

@@ -1,9 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
-    android:layout_height="wrap_content"
-    android:paddingLeft="16dp"
-    android:paddingRight="16dp"
+    android:layout_height="match_parent"
     android:orientation="vertical">
 
     <ListView
@@ -12,6 +10,8 @@
         android:divider="@android:color/transparent"
         android:focusable="true"
         android:focusableInTouchMode="true"
+        android:paddingLeft="16dp"
+        android:paddingRight="16dp"
         android:layout_marginTop="8dp"
         android:layout_width="match_parent"
         android:layout_height="match_parent" />