Removes more Back references for generic tutorial styles.

Change-Id: Ie959f897ee19d636eabfd8cbe9a8a2615264d4cf
diff --git a/quickstep/res/values/styles.xml b/quickstep/res/values/styles.xml
index 14e054e..4915f5f 100644
--- a/quickstep/res/values/styles.xml
+++ b/quickstep/res/values/styles.xml
@@ -26,29 +26,29 @@
         <item name="android:layout_height">wrap_content</item>
     </style>
 
-    <style name="TextAppearance.BackGestureTutorial"
+    <style name="TextAppearance.GestureTutorial"
         parent="android:TextAppearance.Material.Body1" />
 
-    <style name="TextAppearance.BackGestureTutorial.CallToAction"
+    <style name="TextAppearance.GestureTutorial.CallToAction"
         parent="android:TextAppearance.Material.Body2" />
 
-    <style name="TextAppearance.BackGestureTutorial.Title"
-        parent="TextAppearance.BackGestureTutorial">
+    <style name="TextAppearance.GestureTutorial.Title"
+        parent="TextAppearance.GestureTutorial">
         <item name="android:gravity">center</item>
         <item name="android:textColor">@color/gesture_tutorial_title_color</item>
         <item name="android:textSize">28sp</item>
     </style>
 
-    <style name="TextAppearance.BackGestureTutorial.Subtitle"
-        parent="TextAppearance.BackGestureTutorial">
+    <style name="TextAppearance.GestureTutorial.Subtitle"
+        parent="TextAppearance.GestureTutorial">
         <item name="android:gravity">center</item>
         <item name="android:textColor">@color/gesture_tutorial_subtitle_color</item>
         <item name="android:letterSpacing">0.03</item>
         <item name="android:textSize">21sp</item>
     </style>
 
-    <style name="TextAppearance.BackGestureTutorial.ButtonLabel"
-        parent="TextAppearance.BackGestureTutorial.CallToAction">
+    <style name="TextAppearance.GestureTutorial.ButtonLabel"
+        parent="TextAppearance.GestureTutorial.CallToAction">
         <item name="android:gravity">center</item>
         <item name="android:textColor">@color/gesture_tutorial_action_button_label_color</item>
         <item name="android:letterSpacing">0.02</item>
@@ -56,8 +56,8 @@
         <item name="android:textAllCaps">false</item>
     </style>
 
-    <style name="TextAppearance.BackGestureTutorial.TextButtonLabel"
-        parent="TextAppearance.BackGestureTutorial.ButtonLabel">
+    <style name="TextAppearance.GestureTutorial.TextButtonLabel"
+        parent="TextAppearance.GestureTutorial.ButtonLabel">
         <item name="android:textColor">@color/gesture_tutorial_primary_color</item>
     </style>