Fix duplicate IDs in Material controls demo

Change-Id: Ic87b4ae520ba22387e4902bdc6b841b635921080
diff --git a/samples/ApiDemos/res/layout/controls_material.xml b/samples/ApiDemos/res/layout/controls_material.xml
index d705786..fda8255 100644
--- a/samples/ApiDemos/res/layout/controls_material.xml
+++ b/samples/ApiDemos/res/layout/controls_material.xml
@@ -238,7 +238,7 @@
                 style="@android:style/TextAppearance.Material.Body1" />
 
             <SeekBar
-                android:id="@+id/edit"
+                android:id="@+id/seekbar"
                 android:layout_width="200dp"
                 android:layout_height="48dp" />
 
@@ -254,7 +254,7 @@
                 style="@android:style/TextAppearance.Material.Body1" />
 
             <SeekBar
-                android:id="@+id/edit"
+                android:id="@+id/seekbar_discrete"
                 android:layout_width="200dp"
                 android:layout_height="48dp"
                 android:max="7"