Generalize Russian to Slavic layout

Adding Belarusian, Kyrgyz, and Ukrainian keyboards will follows.

Bug: 5738545
Change-Id: I05055d519fac8c67f728cee693b133c3dfb29047
diff --git a/java/res/xml-ru/keyboard_set.xml b/java/res/xml-ru/keyboard_set.xml
index eabee5d..0a158d9 100644
--- a/java/res/xml-ru/keyboard_set.xml
+++ b/java/res/xml-ru/keyboard_set.xml
@@ -23,7 +23,7 @@
     latin:keyboardLocale="ru">
     <Element
         latin:elementName="alphabet"
-        latin:elementKeyboard="@xml/kbd_russian" />
+        latin:elementKeyboard="@xml/kbd_slavic" />
     <Element
         latin:elementName="symbols"
         latin:elementKeyboard="@xml/kbd_symbols" />