Fix minor UI issue

res/layout/activity_account_details.xml

@@ -37,6 +37,7 @@
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:layout_marginTop="32dp"
+            app:labeledEditText_background="@color/loki_darkest_gray"
             app:labeledEditText_label="@string/activity_account_details_name_edit_text_label"/>
 
         <com.dd.CircularProgressButton

res/layout/activity_key_pair.xml

@@ -73,6 +73,7 @@
             android:layout_marginTop="16dp"
             android:layout_marginBottom="20dp"
             android:visibility="gone"
+            app:labeledEditText_background="@color/loki_darkest_gray"
             app:labeledEditText_label="@string/activity_key_pair_mnemonic_edit_text_label"/>
 
         <Button

res/layout/activity_new_conversation.xml

@@ -17,6 +17,7 @@
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:layout_marginTop="32dp"
+            app:labeledEditText_background="@color/loki_darkest_gray"
             app:labeledEditText_label="@string/activity_new_conversation_public_key_edit_text_label"/>
 
         <TextView