Tweak vertical gap of Emoji palette

Bug: 11140087
Change-Id: I8163568a9d7f9d321148001e161c672f78796c96
diff --git a/java/src/com/android/inputmethod/keyboard/internal/DynamicGridKeyboard.java b/java/src/com/android/inputmethod/keyboard/internal/DynamicGridKeyboard.java
index 09766ac..3133e54 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/DynamicGridKeyboard.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/DynamicGridKeyboard.java
@@ -184,12 +184,12 @@
 
     private int getKeyY0(final int index) {
         final int row = index / mColumnsNum;
-        return row * mVerticalStep;
+        return row * mVerticalStep + mVerticalGap / 2;
     }
 
     private int getKeyY1(final int index) {
         final int row = index / mColumnsNum + 1;
-        return row * mVerticalStep;
+        return row * mVerticalStep + mVerticalGap / 2;
     }
 
     @Override