Clean up Devanagari key definitions

java/res/xml-v16/key_devanagari_sign_anusvara.xml

java/res/xml-v16/key_devanagari_sign_candrabindu.xml

java/res/xml-v16/key_devanagari_sign_nukta.xml

java/res/xml-v16/key_devanagari_sign_virama.xml

java/res/xml-v16/key_devanagari_sign_visarga.xml

java/res/xml-v16/key_devanagari_vowel_sign_candra_o.xml

java/res/xml-v16/key_devanagari_vowel_sign_vocalic_r.xml

java/res/xml-v16/key_nepali_romanized2_shift.xml

java/res/xml-v16/keys_hindi1_left5.xml

java/res/xml-v16/keys_hindi2_left5.xml

java/res/xml-v16/keys_hindi3_left2.xml

java/res/xml-v16/keystyle_devanagari_vowel_sign_aa.xml

java/res/xml-v16/keystyle_devanagari_vowel_sign_ai.xml

java/res/xml-v16/keystyle_devanagari_vowel_sign_au.xml

java/res/xml-v16/keystyle_devanagari_vowel_sign_e.xml

java/res/xml-v16/keystyle_devanagari_vowel_sign_i.xml

java/res/xml-v16/keystyle_devanagari_vowel_sign_ii.xml

java/res/xml-v16/keystyle_devanagari_vowel_sign_o.xml

java/res/xml-v16/keystyle_devanagari_vowel_sign_u.xml

java/res/xml-v16/keystyle_devanagari_vowel_sign_uu.xml