Use action key background for enter key

This CL also use an action key background for the emoji key only on
phone becase the emoji key share the same position with other action
keys. The emoji key on tablet keeps using the functional key
background.

Bug: 15296851
Change-Id: I7b8550c61f19548f463a782342bdc0f496433a2a

java/res/xml-sw600dp/key_styles_enter.xml

@@ -102,7 +102,7 @@
         latin:keySpec="!icon/enter_key|!code/key_enter"
         latin:keyLabelFlags="preserveCase|autoXScale|followKeyLabelRatio|followFunctionalTextColor"
         latin:keyActionFlags="noKeyPreview"
-        latin:backgroundType="functional"
+        latin:backgroundType="action"
         latin:parentStyle="navigateMoreKeysStyle" />
     <switch>
         <!-- Shift + Enter in textMultiLine field. -->

java/res/xml/key_styles_common.xml

@@ -82,7 +82,7 @@
         latin:styleName="emojiKeyStyle"
         latin:keySpec="!icon/emoji_key|!code/key_emoji"
         latin:keyActionFlags="noKeyPreview"
-        latin:backgroundType="functional" />
+        latin:backgroundType="action" />
     <include
         latin:keyboardLayout="@xml/key_styles_enter" />
     <key-style

java/res/xml/key_styles_enter.xml

@@ -257,7 +257,7 @@
         latin:styleName="defaultEnterKeyStyle"
         latin:keyLabelFlags="preserveCase|autoXScale|followKeyLabelRatio|followFunctionalTextColor"
         latin:keyActionFlags="noKeyPreview"
-        latin:backgroundType="functional"
+        latin:backgroundType="action"
         latin:parentStyle="navigateMoreKeysStyle" />
     <key-style
         latin:styleName="shiftEnterKeyStyle"