Remove unnecessary line in keybase fragment

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

@@ -30,11 +30,6 @@
                 android:layout_height="wrap_content"
                 android:text="@string/section_keybase_proofs" />
 
-            <View
-                android:layout_width="match_parent"
-                android:layout_height="1dip"
-                android:background="?android:attr/listDivider" />
-
             <LinearLayout
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"