Various theme picker fixes.

- Add Previous button to custom flow
- Seed custom flow with the currently applied bundled theme
- Use add drawable icon instead of text
- Add padding between checkbox and "Add current wallpaper"
- Show ripple background on "Tap to edit"

Fixes: 130763331
Fixes: 130753131
Fixes: 130761402
Fixes: 130759176
Bug: 130759508
Test: visual
Change-Id: Ia82344befe8ac45489646d840453a71e31c83eae
diff --git a/res/values/styles.xml b/res/values/styles.xml
index 1b69e3d..dd44a91 100644
--- a/res/values/styles.xml
+++ b/res/values/styles.xml
@@ -58,6 +58,8 @@
 
     <style name="ActionPrimaryButton" parent="android:Widget.DeviceDefault.Button.Colored"/>
 
+    <style name="ActionSecondaryButton" parent="android:Widget.DeviceDefault.Button.Borderless.Colored"/>
+
     <style name="OptionTitleTextAppearance" parent="@android:style/TextAppearance.DeviceDefault.Widget.ActionBar.Title">
         <item name="android:textColor">@color/option_title_color</item>
         <item name="android:textAlignment">center</item>
@@ -100,7 +102,7 @@
 
     <style name="ComponentCounterTextAppearance" parent="@android:style/TextAppearance.DeviceDefault"/>
 
-    <style name="EditLabelTextAppearance" parent="@android:style/TextAppearance.DeviceDefault">
-        <item name="android:textColor">?android:colorAccent</item>
+    <style name="EditLabelStyle" parent="@style/ActionSecondaryButton">
+        <item name="android:textAppearance">@android:style/TextAppearance.DeviceDefault</item>
     </style>
 </resources>