Fix Sinhala keyboard for tablet device

This CL introduces fontDefault flag to keyLabelFlags of Key attribute
to reset font specification to keyTypeface attribute.

This is a followup of I065824f3fa.

Bug: 6911143
Change-Id: I33bd4a23aaea73e2b17175ddd39053ec915d5451
diff --git a/java/res/xml-sw600dp/rows_sinhala.xml b/java/res/xml-sw600dp/rows_sinhala.xml
index 23c3f3a..d3a5ca5 100644
--- a/java/res/xml-sw600dp/rows_sinhala.xml
+++ b/java/res/xml-sw600dp/rows_sinhala.xml
@@ -25,6 +25,7 @@
         latin:keyboardLayout="@xml/key_styles_common" />
     <Row
         latin:keyWidth="8.182%p"
+        latin:keyLabelFlags="fontNormal|autoXScale"
     >
         <include
             latin:keyboardLayout="@xml/rowkeys_sinhala1" />
@@ -34,6 +35,7 @@
     </Row>
     <Row
         latin:keyWidth="8.182%p"
+        latin:keyLabelFlags="fontNormal|autoXScale"
     >
         <include
             latin:keyboardLayout="@xml/rowkeys_sinhala2" />
@@ -43,6 +45,7 @@
     </Row>
     <Row
         latin:keyWidth="8.182%p"
+        latin:keyLabelFlags="fontNormal|autoXScale"
     >
         <Key
             latin:keyStyle="shiftKeyStyle"