Decrease character limit for "Home settings" to 20.

Test: No
Bug: 194892641
Change-Id: I249c270970242cd64a7f2c1c376ffd76c5848ef6
diff --git a/res/values/strings.xml b/res/values/strings.xml
index d7a1506..e215c20 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -251,7 +251,7 @@
     <string name="wallpaper_button_text">Wallpapers</string>
     <!-- Text for wallpaper change button [CHAR LIMIT=30]-->
     <string name="styles_wallpaper_button_text">Wallpaper &amp; style</string>
-    <!-- Text for settings button [CHAR LIMIT=30]-->
+    <!-- Text for settings button [CHAR LIMIT=20]-->
     <string name="settings_button_text">Home settings</string>
     <!-- Message shown when a feature is disabled by the administrator -->
     <string name="msg_disabled_by_admin">Disabled by your admin</string>