Fix forgotten resource name change

Change-Id: I27ea28c7ea93e50ea8f0d947df95e3ab6d146f11

java/res/values-sw600dp/config.xml

@@ -31,7 +31,7 @@
     <!-- Long pressing space will invoke IME switcher if > 0, never invoke IME switcher if == 0 -->
     <integer name="config_long_press_space_key_timeout">0</integer>
     <!-- This configuration is the index of the array {@link KeyboardSwitcher.KEYBOARD_THEMES}. -->
-    <string name="config_default_keyboard_theme_id" translatable="false">5</string>
+    <string name="config_default_keyboard_theme_index" translatable="false">5</string>
     <integer name="config_max_more_keys_column">5</integer>
     <!--
         Configuration for LatinKeyboardView

java/res/values-sw768dp/config.xml

@@ -29,7 +29,7 @@
     <!-- Long pressing space will invoke IME switcher if > 0, never invoke IME switcher if == 0 -->
     <integer name="config_long_press_space_key_timeout">0</integer>
     <!-- This configuration is the index of the array {@link KeyboardSwitcher.KEYBOARD_THEMES}. -->
-    <string name="config_default_keyboard_theme_id" translatable="false">5</string>
+    <string name="config_default_keyboard_theme_index" translatable="false">5</string>
     <integer name="config_max_more_keys_column">5</integer>
     <!--
         Configuration for LatinKeyboardView

java/res/xml/prefs_for_debug.xml

@@ -32,7 +32,7 @@
             android:persistent="true"
             android:entryValues="@array/keyboard_layout_modes_values"
             android:entries="@array/keyboard_layout_modes"
-            android:defaultValue="@string/config_default_keyboard_theme_id"
+            android:defaultValue="@string/config_default_keyboard_theme_index"
             />
 
     <CheckBoxPreference