Update tablet keyboard layout to version 4

java/res/drawable-mdpi/key_hint_underline_large_holo.9.png

java/res/xml-xlarge/kbd_phone.xml

java/res/xml-xlarge/kbd_phone_symbols.xml

java/res/xml-xlarge/kbd_qwerty.xml

java/res/xml-xlarge/kbd_qwerty_row1.xml

java/res/xml-xlarge/kbd_qwerty_row2.xml

java/res/xml-xlarge/kbd_qwerty_row3.xml

java/res/xml-xlarge/kbd_qwerty_row4.xml

java/res/xml-xlarge/kbd_symbols.xml

java/res/xml-xlarge/kbd_symbols_shift.xml