gui: Convert UI to use Fragments

Change-Id: I7269604a1da72e6b22f4bbac31c1f5561660ccf5
Refs: #2646, #2667
diff --git a/app/src/main/res/layout/create_face.xml b/app/src/main/res/layout/create_face.xml
index 6588dcc..02d40a6 100644
--- a/app/src/main/res/layout/create_face.xml
+++ b/app/src/main/res/layout/create_face.xml
@@ -7,7 +7,7 @@
     <TextView
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        style="@style/dialog_margin"
+        style="@style/default_dialog_margin"
         android:textAppearance="?android:attr/textAppearanceMedium"
         android:text="Enter FaceUri for the remote NDN daemon"
         android:layout_gravity="center_horizontal"/>
@@ -16,7 +16,7 @@
         android:id="@+id/faceUri"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        style="@style/dialog_margin"
+        style="@style/default_dialog_margin"
         android:hint="Face URI"
         android:inputType="text"
         android:focusable="true"