Launcher3: increase all apps top margin

increase all_apps_header_top_margin so that search box is
nicly layed out

Change-Id: I4ca914601326dacbc543c58b89574484147c5ee0
diff --git a/res/values/dimens.xml b/res/values/dimens.xml
index 05724e2..562da3b 100644
--- a/res/values/dimens.xml
+++ b/res/values/dimens.xml
@@ -110,7 +110,7 @@
     <dimen name="all_apps_header_pill_corner_radius">12dp</dimen>
     <dimen name="all_apps_header_tab_height">48dp</dimen>
     <dimen name="all_apps_tabs_indicator_height">2dp</dimen>
-    <dimen name="all_apps_header_top_margin">33dp</dimen>
+    <dimen name="all_apps_header_top_margin">50dp</dimen>
     <dimen name="all_apps_header_top_padding">36dp</dimen>
     <!-- Additional top padding to add when Floating Searchbar is enabled. -->
     <dimen name="all_apps_additional_top_padding_floating_search">16dp</dimen>